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Olympus E-M1 III vs Panasonic GX9

The Olympus OM-D E-M1 Mark III and the Panasonic Lumix DC-GX9 are two enthusiast cameras that were revealed to the public, respectively, in February 2020 and February 2018. Both the E-M1 III and the GX9 are mirrorless interchangeable lens cameras that are equipped with a Four Thirds sensor. Both cameras offer a resolution of 20.2 megapixels.

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

Headline Specifications
Olympus E-M1 III
versus
Panasonic GX9
Olympus E-M1 III   Panasonic GX9
Mirrorless system camera Mirrorless system camera
Micro Four Thirds lenses Micro Four Thirds lenses
20.2 MP – Four Thirds sensor 20.2 MP – Four Thirds sensor
4K/30p Video 4K/30p Video
ISO 200-25,600 ISO 200-25,600
Electronic viewfinder (2360k dots) Electronic viewfinder (2760k dots)
3.0" LCD – 1037k dots 3.0" LCD – 1240k dots
Swivel touchscreen Tilting touchscreen
18 shutter flaps per second 9 shutter flaps per second
In-body stabilizationIn-body stabilization
Weathersealed bodynot weather sealed
420 shots per battery charge260 shots per battery charge
134 x 91 x 69 mm, 580 g 124 x 72 x 47 mm, 407 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Olympus OM-D E-M1 Mark III and the Panasonic Lumix DC-GX9? 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 Olympus E-M1 III and the Panasonic GX9 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 width, height and depth dimensions are rounded to the nearest millimeter.

The GX9 can be obtained in two different colors (black, silver), while the E-M1 III is only available in black.

Size Olympus E-M1 III vs Panasonic GX9
Compare E-M1 III versus GX9 top
Comparison E-M1 III or GX9 rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Panasonic GX9 is notably smaller (27 percent) than the Olympus E-M1 III. Moreover, the GX9 is markedly lighter (30 percent) than the E-M1 III. It is worth mentioning in this context that the E-M1 III is splash and dust resistant, while the GX9 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. In this particular case, both cameras feature the same lens mount, so that they can use the same lenses. You can compare the optics available in the Micro Four Thirds Lens Catalog. Mirrorless cameras, such as the two under consideration, have the additional advantage of having a short flange to focal plane distance, which makes it possible to mount many lenses from other systems onto the camera via adapters.

Concerning battery life, the E-M1 III gets 420 shots out of its Olympus BLH-1 battery, while the GX9 can take 260 images on a single charge of its Panasonic DMW-BLG10 power pack. The battery packs of both cameras can be charged via USB, which can be very convenient when travelling.

The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. If you want to switch the focus of the display and review another camera pair, you can move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.

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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.
 
Olympus E-M1 III 134 mm 91 mm 69 mm 580 g 420 Y Feb 2020 US$ 1 799ebay.com
2.
 
Panasonic GX9 124 mm 72 mm 47 mm 407 g 260 n Feb 2018 US$ 849ebay.com
3.
 
Olympus E-M1 130 mm 94 mm 63 mm 497 g 350 Y Sep 2013 US$ 1 399ebay.com
4.
 
Olympus E-M1 II 134 mm 91 mm 67 mm 574 g 440 Y Sep 2016 US$ 1 999ebay.com
5.
 
Olympus E-M1X 144 mm 147 mm 75 mm 997 g 870 Y Jan 2019 US$ 2 999ebay.com
6.
 
Olympus E-M5 III 125 mm 85 mm 50 mm 414 g 310 Y Oct 2019 US$ 1 199ebay.com
7.
 
OM System OM-1 135 mm 92 mm 73 mm 599 g 520 Y Feb 2022 US$ 2 199ebay.com
8.
 
Panasonic G9 137 mm 97 mm 92 mm 658 g 400 Y Nov 2017 US$ 1 699ebay.com
9.
 
Panasonic G95 130 mm 94 mm 77 mm 536 g 290 Y Apr 2019 US$ 999ebay.com
10.
 
Panasonic GH5 139 mm 98 mm 87 mm 725 g 410 Y Jan 2017 US$ 1 999ebay.com
11.
 
Panasonic GH5 II 139 mm 98 mm 87 mm 727 g 400 Y May 2021 US$ 1 699 amazon.com
12.
 
Panasonic GX7 123 mm 71 mm 55 mm 402 g 350 n Aug 2013 US$ 999ebay.com
13.
 
Panasonic GX8 133 mm 78 mm 63 mm 487 g 330 Y Jul 2015 US$ 1 199ebay.com
14.
 
Panasonic GX85 122 mm 71 mm 44 mm 426 g 290 n Apr 2016 US$ 799 amazon.com
15.
 
Panasonic LX100 II 115 mm 66 mm 65 mm 392 g 300 n Aug 2018 US$ 999ebay.com
16.
 
Panasonic ZS200 111 mm 65 mm 45 mm 340 g 370 n Feb 2018 US$ 799 amazon.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 listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The GX9 was launched at a markedly lower price (by 53 percent) than the E-M1 III, 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 size of the sensor inside a digital camera is one of the key determinants of image quality. A large sensor will tend to have larger individual pixels that provide better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixel-units 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.

Both cameras under consideration feature a Four Thirds sensor and have a format factor (sometimes also referred to as "crop factor") of 2.0. Within the spectrum of camera sensors, this places the review cameras among the medium-sized sensor cameras that aim to strike a balance between image quality and portability. Both cameras feature a native aspect ratio (sensor width to sensor height) of 4:3.

Olympus E-M1 III and Panasonic GX9 sensor measures

The two cameras under review do not only share the same sensor size, but also offer an identical resolution of 20.2 megapixels. This similarity in sensor specs implies that both the E-M1 III and the GX9 have the same pixel density, as well as the same pixel size. It should, however, be noted that the E-M1 III is a somewhat more recent model (by 1 year and 11 months) than the GX9, and its sensor might have benefitted from technological advances during this time. 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 E-M1 III has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

Unlike the GX9, the E-M1 III has the capacity to capture high quality composite images (80MP) by combining multiple shots after shifting its sensor by miniscule distances. This multi-shot, pixel-shift mode is most suitable for photography of stationary objects (landscapes, studio scenes).

The Olympus OM-D E-M1 Mark III has a native sensitivity range from ISO 200 to ISO 25600, which can be extended to ISO 64-25600. The corresponding ISO settings for the Panasonic Lumix DC-GX9 are ISO 200 to ISO 25600, with the possibility to increase the ISO range to 100-25600.

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.

E-M1 III versus GX9 MP

Consistent information on actual sensor performance is available from DXO Mark for many cameras. This service is based on lab testing and assigns an overall score to each camera sensor, as well as ratings for dynamic range ("DXO Landscape"), color depth ("DXO Portrait"), and low-light sensitivity ("DXO Sports"). 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.
 
Olympus E-M1 III Four Thirds 20.2 5184 38884K/30p23.313.1135676
2.
 
Panasonic GX9 Four Thirds 20.2 5184 38884K/30p23.112.8116374
3.
 
Olympus E-M1 Four Thirds 15.9 4608 34561080/30p23.012.775773
4.
 
Olympus E-M1 II Four Thirds 20.2 5184 38884K/30p23.712.8131280
5.
 
Olympus E-M1X Four Thirds 20.2 5184 38884K/30p23.213.0125475
6.
 
Olympus E-M5 III Four Thirds 20.2 5184 38884K/30p23.313.1132476
7.
 
OM System OM-1 Four Thirds 20.2 5184 38884K/60p23.413.4155377
8.
 
Panasonic G9 Four Thirds 20.2 5184 38884K/60p23.112.8113874
9.
 
Panasonic G95 Four Thirds 20.2 5184 38884K/30p23.213.0127375
10.
 
Panasonic GH5 Four Thirds 20.2 5184 38884K/60p23.913.080777
11.
 
Panasonic GH5 II Four Thirds 20.2 5184 38884K/60p23.713.1113679
12.
 
Panasonic GX7 Four Thirds 15.8 4592 34481080/60p22.612.271870
13.
 
Panasonic GX8 Four Thirds 20.2 5184 38884K/30p23.512.680675
14.
 
Panasonic GX85 Four Thirds 15.8 4592 34484K/30p22.912.666271
15.
 
Panasonic LX100 II Four Thirds 16.8 4736 35524K/30p22.812.797972
16.
 
Panasonic ZS200 1-inch 20.0 5472 36484K/30p22.012.244964
Note: DXO values in italics represent estimates based on sensor size and age.

Many modern cameras are not only capable of taking still images, but can also record movies. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, and both provide the same movie specifications (4K/30p).

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Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. The two cameras under review are similar with respect to both having an electronic viewfinder. However, the one in the GX9 offers a higher resolution than the one in the E-M1 III (2760k vs 2360k dots). The adjacent table lists some of the other core features of the Olympus E-M1 III and Panasonic GX9 along with similar information for a selection of comparators.

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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.
 
Olympus E-M1 III2360 n3.0 / 1037 swivel Y 1/8000s 18.0/s n Y
2.
 
Panasonic GX92760 n3.0 / 1240 tilting Y 1/4000s 9.0/s Y Y
3.
 
Olympus E-M12360 n3.0 / 1037 tilting Y 1/8000s 10.0/s n Y
4.
 
Olympus E-M1 II2360 n3.0 / 1037 swivel Y 1/8000s 18.0/s n Y
5.
 
Olympus E-M1X2360 n3.0 / 1037 swivel Y 1/8000s 18.0/s n Y
6.
 
Olympus E-M5 III2360 n3.0 / 1040 swivel Y 1/8000s 10.0/s n Y
7.
 
OM System OM-15760 n3.0 / 1640 swivel Y 1/8000s 10.0/s n Y
8.
 
Panasonic G93680 Y3.0 / 1040 swivel Y 1/8000s 20.0/s n Y
9.
 
Panasonic G952360 n3.0 / 1240 swivel Y 1/4000s 9.0/s Y Y
10.
 
Panasonic GH53680 n3.2 / 1620 swivel Y 1/8000s 12.0/s n Y
11.
 
Panasonic GH5 II3680 n3.0 / 1840 swivel Y 1/8000s 12.0/s n Y
12.
 
Panasonic GX72760 n3.0 / 1040 tilting Y 1/8000s 5.0/s Y Y
13.
 
Panasonic GX82360 n3.0 / 1040 swivel Y 1/8000s 10.0/s n Y
14.
 
Panasonic GX852765 n3.0 / 1040 tilting Y 1/4000s 8.0/s Y Y
15.
 
Panasonic LX100 II2764 n3.0 / 1240 fixed Y 1/4000s 11.0/s n Y
16.
 
Panasonic ZS2002330 n3.0 / 1240 fixed Y 1/2000s 10.0/s Y Y
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One difference between the cameras concerns the presence of an on-board flash. The GX9 has one, while the E-M1 III does not. While the built-in flash of the GX9 is not very powerful, it can at times be useful as a fill-in light.

The E-M1 III 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 GX9 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, both cameras under consideration feature an 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 Olympus E-M1 III and the Panasonic GX9 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 E-M1 III and the GX9 write their files to SDXC cards. The E-M1 III features dual card slots, which can be very useful in case a memory card fails. In contrast, the GX9 only has one slot. The E-M1 III supports UHS-II cards (on its first slot), while the GX9 can use UHS-I cards.

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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 Olympus OM-D E-M1 Mark III and Panasonic Lumix DC-GX9 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.
 
Olympus E-M1 IIIYstereo / monoYYmicro3.1Y-Y
2.
 
Panasonic GX9Ystereo / mono--micro2.0Y-Y
3.
 
Olympus E-M1Ystereo / monoY-micro2.0Y--
4.
 
Olympus E-M1 IIYstereo / monoYYmicro3.0Y--
5.
 
Olympus E-M1XYstereo / monoYYmicro3.0Y-Y
6.
 
Olympus E-M5 IIIYstereo / monoY-micro2.0Y-Y
7.
 
OM System OM-1Ystereo / monoYYmicro3.0Y-Y
8.
 
Panasonic G9Ystereo / monoYYfull3.0Y-Y
9.
 
Panasonic G95Ystereo / monoYYmicro2.0Y-Y
10.
 
Panasonic GH5Ystereo / monoYYfull3.1Y-Y
11.
 
Panasonic GH5 IIYstereo / monoYYfull3.2Y-Y
12.
 
Panasonic GX7Ystereo / mono--mini2.0YY-
13.
 
Panasonic GX8Ystereo / monoY-micro2.0YY-
14.
 
Panasonic GX85Ystereo / mono--micro2.0Y--
15.
 
Panasonic LX100 IIYstereo / mono--micro2.0Y-Y
16.
 
Panasonic ZS200-stereo / mono--micro2.0Y-Y

It is notable that the E-M1 III has a microphone port, which is missing on the GX9. Such an external microphone input can help to substantially improve the quality of audio recordings when a good external microphone is used.

Studio photographers will appreciate that the Olympus E-M1 III (unlike the GX9) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

Both the E-M1 III and the GX9 have been discontinued, but can regularly be found used on ebay. The E-M1 III was replaced by the OM System OM-1, while the GX9 does not have a direct successor. Further information on the features and operation of the E-M1 III and GX9 can be found, respectively, in the Olympus E-M1 III Manual (free pdf) or the online Panasonic GX9 Manual.

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Review summary

So how do things add up? Is there a clear favorite between the Olympus E-M1 III and the Panasonic GX9? Which camera is better? Below is a summary of the relative strengths of each of the two contestants.

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Arguments in favor of the Olympus OM-D E-M1 Mark III:

  • High quality composites: Can combine several shots after pixel-shifting its sensor.
  • Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
  • 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.
  • Larger viewfinder image: Features a viewfinder with a higher magnification (0.74x vs 0.70x).
  • More flexible LCD: Has a swivel screen for odd-angle shots in portrait or landscape orientation.
  • More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
  • Faster burst: Shoots at higher frequency (18 vs 9 flaps/sec) to capture the decisive moment.
  • Longer lasting: Can take more shots (420 versus 260) on a single battery charge.
  • Better sealing: Is weather sealed to enable shooting in dusty or wet environments.
  • Faster data transfer: Supports a more advanced USB protocol (3.1 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.
  • Faster buffer clearing: Supports a more advanced SD data transfer standard (UHS-II vs UHS-I).
  • More modern: Is somewhat more recent (announced 1 year and 11 months after the GX9).

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Advantages of the Panasonic Lumix DC-GX9:

  • More detailed viewfinder: Has higher resolution electronic viewfinder (2760k vs 2360k dots).
  • More detailed LCD: Has a higher resolution rear screen (1240k vs 1037k dots).
  • More compact: Is smaller (124x72mm vs 134x91mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 173g or 30 percent) and is thus easier to take along.
  • Easier fill-in: Has a small integrated flash to brighten shadows of backlit subjects.
  • More affordable: Was introduced into a lower priced category (53 percent cheaper at launch).
  • More heavily discounted: Has been on the market for longer (launched in February 2018).

If the count of individual advantages (bullet points above) is taken as a guide, the E-M1 III is the clear winner of the match-up (16 : 7 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 wedding photographer will view the differences between cameras in a way that diverges from the perspective of a travel photog, and a person interested in cityscapes has distinct needs from a macro shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

E-M1 III 16:07 GX9

How about other alternatives? Do the specifications of the Olympus E-M1 III and the Panasonic GX9 place the cameras among the top in their class? Find out in the latest Best Mirrorless Interchangeable Lens Camera listing whether the two cameras rank among the cream of the crop.

In any case, while the specs-based evaluation of cameras can be instructive in revealing their potential as photographic tools, it remains incomplete and does no justice, for example, to the way the E-M1 III or the GX9 perform in practice. User reviews that are available, for instance, at amazon can sometimes shed light on these issues, but such feedback is all too often partial, inconsistent, and inaccurate.

Expert reviews

This is why hands-on reviews by experts are important. The following table reports the overall ratings of the cameras as published by some of the major camera 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.
 
Olympus E-M1 III5/5..5/583/1004.5/54/5 Feb 2020 US$ 1 799ebay.com
2.
 
Panasonic GX94/5+4/584/1004.5/54.5/5 Feb 2018 US$ 849ebay.com
3.
 
Olympus E-M15/5+ +..84/1004.5/54.5/5 Sep 2013 US$ 1 399ebay.com
4.
 
Olympus E-M1 II5/5+ +5/585/1004.5/54.5/5 Sep 2016 US$ 1 999ebay.com
5.
 
Olympus E-M1X4.5/5o5/585/1004.5/5.. Jan 2019 US$ 2 999ebay.com
6.
 
Olympus E-M5 III5/5+5/582/1004.5/54.5/5 Oct 2019 US$ 1 199ebay.com
7.
 
OM System OM-15/5....87/1005/54.5/5 Feb 2022 US$ 2 199ebay.com
8.
 
Panasonic G9..+ +5/585/1005/55/5 Nov 2017 US$ 1 699ebay.com
9.
 
Panasonic G954.5/5+4.5/583/1004.5/54.5/5 Apr 2019 US$ 999ebay.com
10.
 
Panasonic GH54.5/5+ +..85/1004.5/55/5 Jan 2017 US$ 1 999ebay.com
11.
 
Panasonic GH5 II4.5/5..4.5/585/1004.5/55/5 May 2021 US$ 1 699 amazon.com
12.
 
Panasonic GX74/5+..79/1005/55/5 Aug 2013 US$ 999ebay.com
13.
 
Panasonic GX85/5+..82/1004.5/54.5/5 Jul 2015 US$ 1 199ebay.com
14.
 
Panasonic GX854.5/5+ +..82/1005/55/5 Apr 2016 US$ 799 amazon.com
15.
 
Panasonic LX100 II4.5/5+4.2/582/1004.5/54.5/5 Aug 2018 US$ 999ebay.com
16.
 
Panasonic ZS200..+ +4.5/581/1004.5/54.5/5 Feb 2018 US$ 799 amazon.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

Care should be taken when interpreting the review scores above, though. The ratings are only valid when referring to cameras in the same category and of the same age. A score, therefore, has to be seen in close connection to the price and market introduction time of the camera, and comparisons of ratings among very different cameras or across long time periods have little meaning. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

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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 use the search menu below. There is also a set of direct links to comparison reviews that other users of the CAM-parator app explored.

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    Specifications: Olympus E-M1 III vs Panasonic GX9

    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 Olympus E-M1 III Panasonic GX9
    Camera Type Mirrorless system camera Mirrorless system camera
    Camera Lens Micro Four Thirds lenses Micro Four Thirds lenses
    Launch Date February 2020 February 2018
    Launch Price USD 1,799 USD 849
    Sensor Specs Olympus E-M1 III Panasonic GX9
    Sensor Technology CMOS CMOS
    Sensor Format Four Thirds Sensor Four Thirds Sensor
    Sensor Size 17.3 x 13.0 mm 17.3 x 13.0 mm
    Sensor Area 224.9 mm2 224.9 mm2
    Sensor Diagonal 21.6 mm 21.6 mm
    Crop Factor 2.0x 2.0x
    Sensor Resolution 20.2 Megapixels 20.2 Megapixels
    Image Resolution 5184 x 3888 pixels 5184 x 3888 pixels
    Pixel Pitch 3.34 μm 3.34 μm
    Pixel Density 8.96 MP/cm2 8.96 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability 4K/30p Video 4K/30p Video
    ISO Setting 200 - 25,600 ISO 200 - 25,600 ISO
    ISO Boost 64 - 25,600 ISO 100 - 25,600 ISO
    Image Processor TruePic IX Venus
    Screen Specs Olympus E-M1 III Panasonic GX9
    Viewfinder Type Electronic viewfinder Electronic viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.74x 0.70x
    Viewfinder Resolution 2360k dots 2760k dots
    LCD Framing Live View Live View
    Rear LCD Size 3.0inch 3.0inch
    LCD Resolution 1037k dots 1240k dots
    LCD Attachment Swivel screen Tilting screen
    Touch Input Touchscreen Touchscreen
    Shooting Specs Olympus E-M1 III Panasonic GX9
    Focus System On-Sensor Phase-detect Contrast-detect AF
    Manual Focusing AidFocus PeakingFocus Peaking
    Max Shutter Speed (mechanical) 1/8000s 1/4000s
    Continuous Shooting 18 shutter flaps/s 9 shutter flaps/s
    Electronic Shutterup to 1/32000sup to 1/16000s
    Time-Lapse PhotographyIntervalometer built-inIntervalometer built-in
    Image StabilizationIn-body stabilizationIn-body stabilization
    Fill Flash no On-Board Flash Built-in Flash
    Storage Medium SDXC cards SDXC cards
    Single or Dual Card Slots Dual card slots Single card slot
    UHS card support Single UHS-II UHS-I
    Connectivity Specs Olympus E-M1 III Panasonic GX9
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket no PC Sync
    USB Connector USB 3.1 USB 2.0
    HDMI Port micro HDMI micro HDMI
    Microphone Port External MIC port no MIC socket
    Headphone Socket Headphone port no Headphone port
    Wifi Support Wifi built-in Wifi built-in
    Bluetooth Support Bluetooth built-in Bluetooth built-in
    Body Specs Olympus E-M1 III Panasonic GX9
    Environmental SealingWeathersealed bodynot weather sealed
    Battery Type Olympus BLH-1 Panasonic DMW-BLG10
    Battery Life (CIPA)420 shots per charge260 shots per charge
    In-Camera Charging USB charging USB charging
    Body Dimensions 134 x 91 x 69 mm
    (5.3 x 3.6 x 2.7 in)
    124 x 72 x 47 mm
    (4.9 x 2.8 x 1.9 in)
    Camera Weight 580 g (20.5 oz) 407 g (14.4 oz)
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    Check E-M1 III offers at
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    Check GX9 offers at
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