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Panasonic GX800 vs Pentax K-3

The Panasonic Lumix DMC-GX800 (called Panasonic GX850 in some regions) and the Pentax K-3 are two digital cameras that were revealed to the public, respectively, in January 2017 and October 2013. The GX800 is a mirrorless interchangeable lens camera, while the K-3 is a DSLR. The cameras are based on a Four Thirds (GX800) and an APS-C (K-3) sensor. The Panasonic has a resolution of 15.8 megapixels, whereas the Pentax provides 24.1 MP.

Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Headline Specifications
Panasonic GX800
versus
Pentax K-3
Panasonic GX800   Pentax K-3
Mirrorless system camera Digital single lens reflex
Micro Four Thirds lenses Pentax K mount lenses
15.8 MP – Four Thirds sensor 24.1 MP – APS-C sensor
4K/30p Video 1080/60i Video
ISO 200-25,600 ISO 100-51,200
No viewfinder, LCD framing Optical viewfinder
3.0" LCD – 1040k dots 3.2" LCD – 1037k dots
Tilting touchscreen Fixed screen (not touch-sensitive)
10 shutter flaps per second 8.3 shutter flaps per second
Lens stabilization onlyIn-body stabilization
not weather sealedWeathersealed body
210 shots per battery charge560 shots per battery charge
107 x 65 x 33 mm, 269 g 131 x 100 x 77 mm, 800 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Panasonic Lumix DMC-GX800 and the Pentax K-3? Which one should you buy? Read on to find out how these two cameras compare with respect to their body size, their imaging sensors, their shooting features, their input-output connections, and their reception by expert reviewers.

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Body comparison

The physical size and weight of the Panasonic GX800 and the Pentax K-3 are illustrated in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive perspectives from the front, the top, and the back are available. All size dimensions are rounded to the nearest millimeter.

The GX800 can be obtained in three different colors (black, silver, red), while the K-3 is available in two color-versions (black, silver).

Size Panasonic GX800 vs Pentax K-3
Compare GX800 versus K-3 top
Comparison GX800 or K-3 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Pentax K-3 is considerably larger (88 percent) than the Panasonic GX800. Moreover, the K-3 is substantially heavier (197 percent) than the GX800. It is noteworthy in this context that the K-3 is splash and dust-proof, while the GX800 does not feature any corresponding weather-sealing.

The above size and weight comparisons are to some extent incomplete since they do not consider the interchangeable lenses that both of these cameras require. Hence, you might want to study and compare the specifications of available lenses in order to get the full picture of the size and weight of the two camera systems.

Concerning battery life, the GX800 gets 210 shots out of its Panasonic DMW-BLH7 battery, while the K-3 can take 560 images on a single charge of its Pentax D-LI90 power pack.

The following table provides a synthesis of the main physical specifications of the two cameras and other similar ones. In case you want to display and compare another camera duo, you can use the CAM-parator app to select your camera combination among a large number of options.

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Body Specifications
  empty Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price
Street
Price
1.
 
Panasonic GX800 107 mm 65 mm 33 mm 269 g 210 n Jan 2017 US$ 549ebay.com
2.
 
Pentax K-3 131 mm 100 mm 77 mm 800 g 560 Y Oct 2013 US$ 1 299ebay.com
3.
 
Canon M10 108 mm 67 mm 35 mm 301 g 255 n Oct 2015 US$ 499ebay.com
4.
 
Canon M100 108 mm 67 mm 35 mm 302 g 295 n Aug 2017 US$ 499ebay.com
5.
 
Nikon D7100 136 mm 107 mm 76 mm 765 g 950 Y Feb 2013 US$ 1 199ebay.com
6.
 
Panasonic G5 120 mm 83 mm 71 mm 396 g 320 n Jul 2012 US$ 599ebay.com
7.
 
Panasonic G6 122 mm 85 mm 71 mm 390 g 340 n Apr 2013 US$ 599ebay.com
8.
 
Panasonic G7 125 mm 86 mm 77 mm 410 g 350 n May 2015 US$ 649ebay.com
9.
 
Panasonic GF5 108 mm 67 mm 37 mm 267 g 360 n Apr 2012 US$ 499ebay.com
10.
 
Panasonic GF6 111 mm 65 mm 38 mm 323 g 340 n Apr 2013 US$ 499ebay.com
11.
 
Panasonic GF7 107 mm 65 mm 33 mm 266 g 230 n Jan 2015 US$ 499ebay.com
12.
 
Panasonic GM1 99 mm 55 mm 30 mm 204 g 230 n Oct 2013 US$ 749ebay.com
13.
 
Panasonic GM5 99 mm 60 mm 36 mm 211 g 220 n Sep 2014 US$ 749ebay.com
14.
 
Pentax K-3 II 131 mm 100 mm 77 mm 800 g 720 Y Apr 2015 US$ 1 099ebay.com
15.
 
Pentax K-5 II 131 mm 97 mm 73 mm 760 g 740 Y Sep 2012 US$ 1 099ebay.com
16.
 
Pentax KP 132 mm 101 mm 76 mm 703 g 390 Y Jan 2017 US$ 1 099ebay.com
17.
 
Sony A77 143 mm 104 mm 81 mm 732 g 470 Y Aug 2011 US$ 1 399ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

Any camera decision will obviously take relative prices into account. The retail prices at the time of the camera’s release place the model in the market relative to other models in the producer’s line-up and the competition. The GX800 was launched at a markedly lower price (by 58 percent) than the K-3, which puts it into a different market segment. Normally, street prices remain initially close to the MSRP, but after a couple of months, the first discounts appear. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.

Sensor comparison

The imaging sensor is at the core of digital cameras and its size is one of the main determining factors of image quality. All other things equal, a large sensor will have larger individual pixel-units that offer better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixels in a sensor of the same technological generation. Moreover, a large sensor camera will give the photographer more control over depth-of-field in the image and, thus, the ability to better isolate a subject from the background. On the downside, larger sensors are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Panasonic GX800 features a Four Thirds sensor and the Pentax K-3 an APS-C sensor. The sensor area in the K-3 is 63 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 2.0 and 1.5. The sensor in the GX800 has a native 4:3 aspect ratio, while the one in the K-3 offers a 3:2 aspect.

Panasonic GX800 and Pentax K-3 sensor measures

With 24.1MP, the K-3 offers a higher resolution than the GX800 (15.8MP), but the K-3 nevertheless has larger individual pixels (pixel pitch of 3.90μm versus 3.77μm for the GX800) due to its larger sensor. However, the GX800 is a much more recent model (by 3 years and 2 months) than the K-3, and its sensor will have benefitted from technological advances during this time that enhance the light gathering capacity of its pixel-units. Coming back to sensor resolution, it should be mentioned that neither of the two cameras has an anti-alias filter installed, so they are able to capture all the detail the sensor resolves.

The resolution advantage of the Pentax K-3 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the K-3 for good quality output (200 dots per inch) amounts to 30.1 x 20 inches or 76.4 x 50.8 cm, for very good quality (250 dpi) 24.1 x 16 inches or 61.1 x 40.6 cm, and for excellent quality (300 dpi) 20.1 x 13.3 inches or 50.9 x 33.9 cm. The corresponding values for the Panasonic GX800 are 23 x 17.2 inches or 58.3 x 43.8 cm for good quality, 18.4 x 13.8 inches or 46.7 x 35 cm for very good quality, and 15.3 x 11.5 inches or 38.9 x 29.2 cm for excellent quality prints.

The Panasonic Lumix DMC-GX800 has a native sensitivity range from ISO 200 to ISO 25600, which can be extended to ISO 100-25600. The corresponding ISO settings for the Pentax K-3 are ISO 100 to ISO 51200 (no boost).

Technology-wise, both cameras are equipped with CMOS (Complementary Metal–Oxide–Semiconductor) sensors. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

GX800 versus K-3 MP

Consistent information on actual sensor performance is available from DXO Mark for many cameras. This service determines an overall sensor rating, as well as sub-scores for low-light sensitivity ("DXO Sports"), dynamic range ("DXO Landscape"), and color depth ("DXO Portrait"). Of the two cameras under consideration, the K-3 has a markedly higher DXO score than the GX800 (overall score 7 points higher), which will translate into better image quality. The advantage is based on 0.5 bits higher color depth, 0.1 EV in additional dynamic range, and 1.1 stops in additional low light sensitivity. The table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar cameras.

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Sensor Characteristics
  empty Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Panasonic GX800 Four Thirds 15.8 4592 34484K/30p23.213.358673
2.
 
Pentax K-3 APS-C 24.1 6016 40001080/60i23.713.4121680
3.
 
Canon M10 APS-C 17.9 5184 34561080/30p22.211.475365
4.
 
Canon M100 APS-C 24.0 6000 40001080/60p23.512.9127278
5.
 
Nikon D7100 APS-C 24.0 6000 40001080/60p24.213.7125683
6.
 
Panasonic G5 Four Thirds 15.9 4608 34561080/60p21.411.661861
7.
 
Panasonic G6 Four Thirds 15.9 4608 34561080/60p21.311.563961
8.
 
Panasonic G7 Four Thirds 15.8 4592 34484K/30p22.812.490471
9.
 
Panasonic GF5 Four Thirds 12.0 4000 30001080/60i20.510.057350
10.
 
Panasonic GF6 Four Thirds 15.8 4592 34481080/60i20.710.662254
11.
 
Panasonic GF7 Four Thirds 15.8 4592 34481080/60p22.712.387470
12.
 
Panasonic GM1 Four Thirds 15.8 4592 34481080/60i22.311.766066
13.
 
Panasonic GM5 Four Thirds 15.8 4592 34481080/60p22.111.772166
14.
 
Pentax K-3 II APS-C 24.1 6016 40001080/60i23.613.6110680
15.
 
Pentax K-5 II APS-C 16.1 4928 32641080/25p23.814.1123582
16.
 
Pentax KP APS-C 24.1 6016 40001080/60i23.913.2169981
17.
 
Sony A77 APS-C 24.0 6000 40001080/60p24.013.280178
Note: DXO values in italics represent estimates based on sensor size and age.

Many modern cameras cannot only take still pictures, but also record videos. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the GX800 provides a higher video resolution than the K-3. It can shoot video footage at 4K/30p, while the Pentax is limited to 1080/60i.

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Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. For example, the K-3 has an optical viewfinder, which can be very useful when shooting in bright sunlight. In contrast, the GX800 relies on live view and the rear LCD for framing. The table below summarizes some of the other core capabilities of the Panasonic GX800 and Pentax K-3 in connection with corresponding information for a sample of similar cameras.

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Core Features
  empty Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Specifications
(inch/000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Max
Shutter
Speed *
Max
Shutter
Flaps *
Built-in
Flash
(yes/no)
Built-in
Image
Stab
1.
 
Panasonic GX800none n3.0 / 1040 tilting Y 1/500s 10.0/s Y n
2.
 
Pentax K-3optical Y3.2 / 1037 fixed n 1/8000s 8.3/s Y Y
3.
 
Canon M10none n3.0 / 1040 tilting Y 1/4000s 4.6/s Y n
4.
 
Canon M100none n3.0 / 1040 tilting Y 1/4000s 6.1/s Y n
5.
 
Nikon D7100optical Y3.2 / 1229 fixed n 1/8000s 6.0/s Y n
6.
 
Panasonic G51440 n3.0 / 920 swivel Y 1/4000s 6.0/s Y n
7.
 
Panasonic G61440 n3.0 / 1036 swivel Y 1/4000s 7.0/s Y n
8.
 
Panasonic G72360 n3.0 / 1040 swivel Y 1/4000s 7.0/s Y n
9.
 
Panasonic GF5none n3.0 / 920 fixed Y 1/4000s 4.0/s Y n
10.
 
Panasonic GF6none n3.0 / 1040 tilting Y 1/4000s 4.2/s Y n
11.
 
Panasonic GF7none n3.0 / 1040 tilting Y 1/500s 5.8/s Y n
12.
 
Panasonic GM1none n3.0 / 1036 fixed Y 1/500s 5.0/s Y n
13.
 
Panasonic GM51166 n3.0 / 921 fixed Y 1/500s 5.8/s n n
14.
 
Pentax K-3 IIoptical Y3.2 / 1037 fixed n 1/8000s 8.3/s n Y
15.
 
Pentax K-5 IIoptical Y3.0 / 921 fixed n 1/8000s 7.0/s Y Y
16.
 
Pentax KPoptical n3.0 / 921 tilting n 1/6000s 7.0/s Y Y
17.
 
Sony A772359 Y3.0 / 921 full-flex n 1/8000s 12.0/s Y Y
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One differentiating feature between the two cameras concerns the touch sensitivity of the rear screen. The GX800 has a touchscreen, while the K-3 has a conventional panel. Touch control can be particularly helpful, for example, for setting the focus point.

The GX800 has an articulated LCD that can be turned to be front-facing. This characteristic will be appreciated by vloggers and photographers who are interested in snapping selfies. In contrast, the K-3 does not have a selfie-screen.

The reported shutter speed information refers to the use of the mechanical shutter. Yet, some cameras only have an electronic shutter, while others have an electronic shutter in addition to a mechanical one. In fact, the GX800 is one of those camera that have an additional electronic shutter, which makes completely silent shooting possible. However, this mode is less suitable for photographing moving objects (risk of rolling shutter) or shooting under artificial light sources (risk of flickering).

The Panasonic GX800 and the Pentax K-3 both have an intervalometer built-in. This enables the photographer to capture time lapse sequences, such as flower blooming, a sunset or moon rise, without purchasing an external camera trigger and related software.

Concerning the storage of imaging data, both the GX800 and the K-3 write their files to SDXC cards. The K-3 features dual card slots, which can be very useful in case a memory card fails. In contrast, the GX800 only has one slot. Both cameras can use UHS-I cards, which provide for Ultra High Speed data transfer of up to 104 MB/s.

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Connectivity comparison

For some imaging applications, the extent to which a camera can communicate with its environment can be an important aspect in the camera decision process. The table below provides an overview of the connectivity of the Panasonic Lumix DMC-GX800 and Pentax K-3 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
  empty Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Panasonic GX800-stereo / mono--micro2.0Y--
2.
 
Pentax K-3Ymono / monoYYmini3.0---
3.
 
Canon M10-stereo / mono--mini2.0YY-
4.
 
Canon M100-stereo / mono--micro2.0YYY
5.
 
Nikon D7100Ystereo / monoYYmini2.0---
6.
 
Panasonic G5Ystereo / mono--mini2.0---
7.
 
Panasonic G6Ystereo / monoY-mini2.0YY-
8.
 
Panasonic G7Ystereo / monoY-micro2.0Y--
9.
 
Panasonic GF5-stereo / mono--mini2.0---
10.
 
Panasonic GF6-stereo / mono--mini2.0YY-
11.
 
Panasonic GF7-stereo / mono--micro2.0YY-
12.
 
Panasonic GM1-stereo / mono--micro2.0Y--
13.
 
Panasonic GM5Ystereo / mono--micro2.0Y--
14.
 
Pentax K-3 IIYmono / monoYYmini3.0---
15.
 
Pentax K-5 IIYstereo / monoY-mini2.0---
16.
 
Pentax KPYstereo / monoY--2.0Y--
17.
 
Sony A77Ystereo / monoY-mini2.0---

It is notable that the GX800 offers wifi support, while the K-3 does not. Wifi can be a very convenient means to transfer image data to an off-camera location.

Studio photographers will appreciate that the Pentax K-3 (unlike the GX800) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the GX800 and the K-3 have been discontinued, but can regularly be found used on ebay. The K-3 was replaced by the Pentax K-3 II, while the GX800 does not have a direct successor. Further information on the features and operation of the GX800 and K-3 can be found, respectively, in the Panasonic GX800 Manual (free pdf) or the online Pentax K-3 Manual.

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Review summary

So how do things add up? Is the Panasonic GX800 better than the Pentax K-3 or vice versa? Below is a summary of the relative strengths of each of the two contestants.

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Reasons to prefer the Panasonic Lumix DMC-GX800:

  • Better video: Provides higher definition movie capture (4K/30p vs 1080/60i).
  • More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
  • Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
  • More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
  • Faster burst: Shoots at higher frequency (10 vs 8.3 flaps/sec) to capture the decisive moment.
  • Less disturbing: Has an electronic shutter option for completely silent shooting.
  • More compact: Is smaller (107x65mm vs 131x100mm) and thus needs less room in the bag.
  • Less heavy: Is lighter (by 531g or 66 percent) and hence easier to carry around.
  • More legacy lens friendly: Can take a broad range of non-native lenses via adapters.
  • Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
  • More affordable: Was introduced into a lower priced category (58 percent cheaper at launch).
  • More modern: Reflects 3 years and 2 months of technical progress since the K-3 launch.

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Advantages of the Pentax K-3:

  • More detail: Has more megapixels (24.1 vs 15.8MP), which boosts linear resolution by 26%.
  • Better image quality: Scores markedly higher (7 points) in the DXO overall evaluation.
  • Better low-light sensitivity: Can shoot in dim conditions (1.1 stops ISO advantage).
  • Better sound: Can connect to an external microphone for higher quality sound recording.
  • Better sound control: Has a headphone port that enables audio monitoring while recording.
  • Easier framing: Has an optical viewfinder for image composition and settings control.
  • Easier setting verification: Features a control panel on top to check shooting parameters.
  • Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review and settings control.
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/500s) to freeze action.
  • Longer lasting: Gets more shots (560 versus 210) out of a single battery charge.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
  • Better lighting: Features a hotshoe and can thus hold and trigger an external flash gun.
  • Faster data transfer: Supports a more advanced USB protocol (3.0 vs 2.0).
  • Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
  • Greater peace of mind: Features a second card slot as a backup in case of memory card failure.
  • More heavily discounted: Has been around for much longer (launched in October 2013).

If the count of individual advantages (bullet points above) is taken as a guide, the K-3 is the clear winner of the contest (17 : 12 points). However, the relevance of individual strengths will vary across photographers, so that you might want to apply your own weighing scheme to the summary points when reflecting and deciding on a new camera. A professional sports photographer will view the differences between cameras in a way that diverges from the perspective of a street photog, and a person interested in family portraits has distinct needs from a landscape shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

GX800 12:17 K-3

How about other alternatives? Do the specifications of the Panasonic GX800 and the Pentax K-3 place the cameras among the top in their class? Find out in the latest Best Mirrorless Interchangeable Lens Camera and Best DSLR Camera listings whether the two cameras rank among the cream of the crop.

In any case, while the comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it remains incomplete and does no justice, for example, to the way the GX800 or the K-3 perform in practice. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.

Expert reviews

This is why expert reviews are important. The table below provides a synthesis of the camera assessments of some of the best known photo-gear review sites (amateurphotographer [AP], cameralabs [CL], digitalcameraworld [DCW], dpreview [DPR], ephotozine [EPZ], photographyblog [PB]). As can be seen, the professional reviewers agree in many cases on the quality of different cameras, but sometimes their assessments diverge, reinforcing the earlier point that a camera decision is often a very personal choice.

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Expert Camera Reviews
  empty  Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price
Street
Price
1.
 
Panasonic GX800..+..76/1004.5/54.5/5 Jan 2017 US$ 549ebay.com
2.
 
Pentax K-34/5....83/1005/55/5 Oct 2013 US$ 1 299ebay.com
3.
 
Canon M10..........4/5 Oct 2015 US$ 499ebay.com
4.
 
Canon M1003/5+....4/53.5/5 Aug 2017 US$ 499ebay.com
5.
 
Nikon D71005/5+ +..85/1004.5/54.5/5 Feb 2013 US$ 1 199ebay.com
6.
 
Panasonic G53/5+ +....4.5/54.5/5 Jul 2012 US$ 599ebay.com
7.
 
Panasonic G64/5+ +....5/54.5/5 Apr 2013 US$ 599ebay.com
8.
 
Panasonic G74/5+ +3.5/580/1005/54.5/5 May 2015 US$ 649ebay.com
9.
 
Panasonic GF53/5......4.5/54.5/5 Apr 2012 US$ 499ebay.com
10.
 
Panasonic GF6..+ +....4.5/54.5/5 Apr 2013 US$ 499ebay.com
11.
 
Panasonic GF74/5+....4.5/54.5/5 Jan 2015 US$ 499ebay.com
12.
 
Panasonic GM13/5+..78/1005/54.5/5 Oct 2013 US$ 749ebay.com
13.
 
Panasonic GM53.5/5+..77/1005/54.5/5 Sep 2014 US$ 749ebay.com
14.
 
Pentax K-3 II4.5/5......5/55/5 Apr 2015 US$ 1 099ebay.com
15.
 
Pentax K-5 II5/5....80/1005/54.5/5 Sep 2012 US$ 1 099ebay.com
16.
 
Pentax KP4/5..3/582/1005/54.5/5 Jan 2017 US$ 1 099ebay.com
17.
 
Sony A775/591/100..81/100..5/5 Aug 2011 US$ 1 399ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The above review scores should be interpreted with care, though. The ratings are only valid when referring to cameras in the same category and of the same age. Hence, a score should always be seen in the context of the camera's market launch date and its price, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, please note that some of the review sites have changed their methodology and reporting over time.

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Other camera comparisons

Did this review help to inform your camera decision process? If you would like to see a different side-by-side camera review, just make a corresponding selection in the search boxes below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications: Panasonic GX800 vs Pentax K-3

    Below is a side-by-side comparison of the specs of the two cameras to facilitate a quick review of their differences and common features.

    Camera Specifications
    Camera Model Panasonic GX800 Pentax K-3
    Camera Type Mirrorless system camera Digital single lens reflex
    Camera Lens Micro Four Thirds lenses Pentax K mount lenses
    Launch Date January 2017 October 2013
    Launch Price USD 549 USD 1,299
    Sensor Specs Panasonic GX800 Pentax K-3
    Sensor Technology CMOS CMOS
    Sensor Format Four Thirds Sensor APS-C Sensor
    Sensor Size 17.3 x 13.0 mm 23.5 x 15.6 mm
    Sensor Area 224.9 mm2 366.6 mm2
    Sensor Diagonal 21.6 mm 28.2 mm
    Crop Factor 2.0x 1.5x
    Sensor Resolution 15.8 Megapixels 24.1 Megapixels
    Image Resolution 4592 x 3448 pixels 6016 x 4000 pixels
    Pixel Pitch 3.77 μm 3.90 μm
    Pixel Density 7.04 MP/cm2 6.56 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 4K/30p Video 1080/60i Video
    ISO Setting 200 - 25,600 ISO 100 - 51,200 ISO
    ISO Boost 100 - 25,600 ISO no Enhancement
    Image Processor Venus PRIME III
    DXO Sensor Quality (score) 73 80
    DXO Color Depth (bits) 23.2 23.7
    DXO Dynamic Range (EV) 13.3 13.4
    DXO Low Light (ISO) 586 1216
    Screen Specs Panasonic GX800 Pentax K-3
    Viewfinder Type no viewfinder Optical viewfinder
    Viewfinder Field of View 100%
    Viewfinder Magnification 0.63x
    Top-Level Screen no Top Display Control Panel
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.2inch
    LCD Resolution 1040k dots 1037k dots
    LCD Attachment Tilting screen Fixed screen
    Touch Input Touchscreen no Touchscreen
    Shooting Specs Panasonic GX800 Pentax K-3
    Focus System Contrast-detect AF Phase-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/500s 1/8000s
    Continuous Shooting 10 shutter flaps/s 8.3 shutter flaps/s
    Electronic Shutterup to 1/16000sno E-Shutter
    Time-Lapse PhotographyIntervalometer built-inIntervalometer built-in
    Image StabilizationLens stabilization onlyIn-body stabilization
    Fill Flash Built-in Flash Built-in Flash
    Storage Medium SDXC cards SDXC cards
    Single or Dual Card Slots Single card slot Dual card slots
    UHS card support UHS-I UHS-I
    Connectivity Specs Panasonic GX800 Pentax K-3
    External Flash no Hotshoe Hotshoe
    Studio Flash no PC Sync PC Sync socket
    USB Connector USB 2.0 USB 3.0
    HDMI Port micro HDMI mini HDMI
    Microphone Port no MIC socket External MIC port
    Headphone Socket no Headphone port Headphone port
    Wifi Support Wifi built-in no Wifi
    Body Specs Panasonic GX800 Pentax K-3
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type Panasonic DMW-BLH7 Pentax D-LI90
    Battery Life (CIPA)210 shots per charge560 shots per charge
    Body Dimensions 107 x 65 x 33 mm
    (4.2 x 2.6 x 1.3 in)
    131 x 100 x 77 mm
    (5.2 x 3.9 x 3.0 in)
    Camera Weight 269 g (9.5 oz) 800 g (28.2 oz)
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