Canon R5 Mark II vs Olympus E-1

The Canon EOS R5 Mark II and the Olympus E-1 are two digital cameras that were revealed to the public, respectively, in July 2024 and June 2003. The R5 Mark II is a mirrorless interchangeable lens camera, while the E-1 is a DSLR. The cameras are based on a full frame (R5 Mark II) and a Four Thirds (E-1) sensor. The Canon has a resolution of 44.8 megapixels, whereas the Olympus provides 4.9 MP.

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

Headline Specifications

Canon R5 Mark II		Olympus E-1
Mirrorless system camera		Digital single lens reflex
Canon RF mount lenses		Four Thirds lenses
44.8 MP – Full Frame sensor		4.9 MP – Four Thirds sensor
8k/60p Video		no Video
ISO 100-51,200 (50 - 102,400)		ISO 100-800 (100 - 3,200)
Electronic viewfinder (5760k dots)		Optical viewfinder
3.2" LCD – 2100k dots		1.8" LCD – 134k dots
Swivel touchscreen		Fixed screen (not touch-sensitive)
12 shutter flaps per second		3 shutter flaps per second
In-body stabilization		Lens stabilization only
Weathersealed body		Weathersealed body
340 shots per battery charge		750 shots per battery charge
138 x 98 x 88 mm, 746 g		141 x 104 x 81 mm, 738 g

Check R5 Mark II price at
amazon.com
Check E-1 offers at
ebay.com

Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS R5 Mark II and the Olympus E-1? 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.

Body comparison

An illustration of the physical size and weight of the Canon R5 Mark II and the Olympus E-1 is provided in the side-by-side display below. The two cameras are presented according to their relative size. Three successive views from the front, the top, and the rear are shown. All size dimensions are rounded to the nearest millimeter.

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Olympus E-1 is notably larger (8 percent) than the Canon R5 Mark II. However, the E-1 is slightly lighter (1 percent) than the R5 Mark II. In this context, it is worth noting that both cameras are splash and dust-proof and can, hence, be used in inclement weather conditions or harsh environments.

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.

The power pack in the R5 Mark II can be charged via the USB port, so that it is not always necessary to take the battery charger along when travelling.

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.

Body Specifications

		Camera Model	Camera Width	Camera Height	Camera Depth	Camera Weight	Battery Life	Weather Sealing	Camera Launch	Launch Price	Street Price
1.		Canon R5 Mark II	138 mm	98 mm	88 mm	746 g	340	Y	Jul 2024	US$ 4 299	amazon.com
2.		Olympus E-1	141 mm	104 mm	81 mm	738 g	750	Y	Jun 2003	US$ 1 699	ebay.com
3.		Canon R1	158 mm	150 mm	87 mm	1115 g	1330	Y	Jul 2024	US$ 6 299	amazon.com
4.		Canon R5	138 mm	98 mm	88 mm	738 g	320	Y	Jul 2020	US$ 3 899	amazon.com
5.		Canon R5 C	142 mm	101 mm	111 mm	770 g	320	Y	Jan 2022	US$ 4 499	amazon.com
6.		Canon R6	138 mm	98 mm	88 mm	680 g	360	Y	Jul 2020	US$ 2 499	amazon.com
7.		Canon R6 Mark II	138 mm	98 mm	88 mm	670 g	450	Y	Nov 2022	US$ 2 499	amazon.com
8.		Leica Digilux 3	146 mm	87 mm	77 mm	606 g	750	n	Sep 2006	US$ 1 499	ebay.com
9.		Nikon Z8	144 mm	119 mm	83 mm	910 g	340	Y	May 2023	US$ 3 999	amazon.com
10.		Olympus E-3	142 mm	116 mm	75 mm	876 g	750	Y	Oct 2007	US$ 1 699	ebay.com
11.		Olympus E-5	142 mm	117 mm	75 mm	873 g	750	Y	Sep 2010	US$ 1 699	ebay.com
12.		Olympus E-300	147 mm	85 mm	64 mm	624 g	750	n	Sep 2004	US$ 799	ebay.com
13.		Olympus E-330	140 mm	87 mm	72 mm	637 g	750	n	Jan 2006	US$ 999	ebay.com
14.		Panasonic S1R II	134 mm	102 mm	92 mm	795 g	350	Y	May 2025	US$ 3 299	amazon.com
15.		Panasonic S5 II	134 mm	102 mm	90 mm	740 g	370	Y	Jan 2023	US$ 1 999	amazon.com
16.		Sony A1 II	136 mm	97 mm	83 mm	743 g	520	Y	Nov 2024	US$ 6 499	amazon.com
17.		Sony A7R V	131 mm	97 mm	82 mm	723 g	530	Y	Oct 2022	US$ 3 899	amazon.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
Convert to Imperial

Any camera decision will naturally be influenced heavily by the price. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The E-1 was launched at a markedly lower price (by 60 percent) than the R5 Mark II, which puts it into a different market segment. Usually, retail prices stay at first close to the launch price, but after several months, discounts become available. 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.

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. Furthermore, a large sensor camera will give the photographer more possibilities to use shallow depth-of-field in order to isolate a subject from the background. On the downside, larger sensors tend to be associated with larger, more expensive camera bodies and lenses.

Of the two cameras under consideration, the Canon R5 Mark II features a full frame sensor and the Olympus E-1 a Four Thirds sensor. The sensor area in the E-1 is 74 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.0 and 2.0. The sensor in the R5 Mark II has a native 3:2 aspect ratio, while the one in the E-1 offers a 4:3 aspect.

With 44.8MP, the R5 Mark II offers a higher resolution than the E-1 (4.9MP), but the R5 Mark II has smaller individual pixels (pixel pitch of 4.39μm versus 6.78μm for the E-1). However, the R5 Mark II is a much more recent model (by 21 years) than the E-1, and its sensor will have benefitted from technological advances during this time that enhance the light gathering capacity of its pixels.

The resolution advantage of the Canon R5 Mark II implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the R5 Mark II for good quality output (200 dots per inch) amounts to 41 x 27.3 inches or 104 x 69.4 cm, for very good quality (250 dpi) 32.8 x 21.9 inches or 83.2 x 55.5 cm, and for excellent quality (300 dpi) 27.3 x 18.2 inches or 69.4 x 46.3 cm. The corresponding values for the Olympus E-1 are 12.8 x 9.6 inches or 32.5 x 24.4 cm for good quality, 10.2 x 7.7 inches or 26 x 19.5 cm for very good quality, and 8.5 x 6.4 inches or 21.7 x 16.3 cm for excellent quality prints.

The R5 Mark II has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

The Canon EOS R5 Mark II has a native sensitivity range from ISO 100 to ISO 51200, which can be extended to ISO 50-102400. The corresponding ISO settings for the Olympus E-1 are ISO 100 to ISO 800, with the possibility to increase the ISO range to 100-3200.

In terms of underlying technology, the R5 Mark II is build around a CMOS sensor, while the E-1 uses a CCD imager. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

For many cameras, data on sensor performance has been reported by DXO Mark. This service assesses and scores the color depth ("DXO Portrait"), dynamic range ("DXO Landscape"), and low-light sensitivity ("DXO Sports") of camera sensors, and also publishes an overall camera score. The table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar cameras.

Sensor Characteristics

		Camera Model	Sensor Class	Resolution (MP)	Horiz. Pixels	Vert. Pixels	Video Format	DXO Portrait	DXO Landscape	DXO Sports	DXO Overall
1.		Canon R5 Mark II	Full Frame	44.8	8192	5464	8k/60p	25.4	14.8	3332	97
2.		Olympus E-1	Four Thirds	4.9	2560	1920	none	20.0	9.7	-145	44
3.		Canon R1	Full Frame	24.0	6000	4000	6K/60p	25.4	14.8	3332	97
4.		Canon R5	Full Frame	44.8	8192	5464	8K/30p	25.3	14.6	3042	95
5.		Canon R5 C	Full Frame	44.8	8192	5464	8k/60p	25.4	14.5	3082	96
6.		Canon R6	Full Frame	20.0	5472	3648	4k/60p	24.2	14.3	3394	90
7.		Canon R6 Mark II	Full Frame	24.0	6000	4000	4k/60p	25.4	14.6	3154	96
8.		Leica Digilux 3	Four Thirds	7.4	3136	2352	none	21.0	10.6	127	53
9.		Nikon Z8	Full Frame	45.4	8256	5504	8K/30p	26.3	14.2	2548	98
10.		Olympus E-3	Four Thirds	10.0	3648	2736	none	21.6	10.5	571	56
11.		Olympus E-5	Four Thirds	12.2	4032	3024	720/30p	21.6	10.5	519	56
12.		Olympus E-300	Four Thirds	8.0	3264	2448	none	20.4	10.1	-40	48
13.		Olympus E-330	Four Thirds	7.4	3136	2352	none	20.8	10.4	73	52
14.		Panasonic S1R II	Full Frame	44.2	8144	5424	8K/30p	25.4	14.8	3406	97
15.		Panasonic S5 II	Full Frame	24.0	6000	4000	6K/30p	25.4	14.6	3158	96
16.		Sony A1 II	Full Frame	49.8	8640	5760	8k/30p	25.4	14.8	3363	97
17.		Sony A7R V	Full Frame	60.2	9504	6336	8k/24p	26.5	14.8	3187	100
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 also of capturing video footage. The R5 Mark II indeed provides movie recording capabilities, while the E-1 does not. The highest resolution format that the R5 Mark II can use is 8k/60p.

Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. For example, the R5 Mark II has an electronic viewfinder (5760k dots), while the E-1 has an optical one. Both systems have their advantages, with the electronic viewfinder making it possible to project supplementary shooting information into the framing view, whereas the optical viewfinder offers lag-free viewing and a very clear framing image. The viewfinders of both cameras offer the same field of view (100%), but the viewfinder of the R5 Mark II has a higher magnification than the one of the E-1 (0.76x vs 0.48x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The adjacent table lists some of the other core features of the Canon R5 Mark II and Olympus E-1 along with similar information for a selection of comparators.

Core Features

		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.		Canon R5 Mark II	5760	Y	3.2 / 2100	swivel	Y	1/8000s	12.0/s	n	Y
2.		Olympus E-1	optical	Y	1.8 / 134	fixed	n	1/4000s	3.0/s	n	n
3.		Canon R1	9440	Y	3.2 / 2100	swivel	Y	1/8000s	12.0/s	n	Y
4.		Canon R5	5760	Y	3.2 / 2100	swivel	Y	1/8000s	12.0/s	n	Y
5.		Canon R5 C	5760	Y	3.2 / 2100	swivel	Y	1/8000s	12.0/s	n	n
6.		Canon R6	3690	n	3.0 / 1620	swivel	Y	1/8000s	12.0/s	n	Y
7.		Canon R6 Mark II	3690	n	3.0 / 1620	swivel	Y	1/8000s	12.0/s	n	Y
8.		Leica Digilux 3	optical	n	2.5 / 207	fixed	n	1/4000s	3.0/s	Y	n
9.		Nikon Z8	3690	Y	3.2 / 2089	full-flex	Y	1/32000s	30.0/s	n	Y
10.		Olympus E-3	optical	Y	2.5 / 230	swivel	n	1/8000s	5.0/s	Y	Y
11.		Olympus E-5	optical	Y	3.0 / 920	swivel	n	1/8000s	5.0/s	Y	Y
12.		Olympus E-300	optical	n	1.8 / 134	fixed	n	1/4000s	2.5/s	Y	n
13.		Olympus E-330	optical	n	2.5 / 215	tilting	n	1/4000s	3.0/s	Y	n
14.		Panasonic S1R II	5760	n	3.2 / 1840	full-flex	Y	1/8000s	9.0/s	n	Y
15.		Panasonic S5 II	3680	n	3.0 / 1840	swivel	Y	1/8000s	9.0/s	n	Y
16.		Sony A1 II	9437	n	3.2 / 2100	full-flex	Y	1/8000s	30.0/s	n	Y
17.		Sony A7R V	9440	n	3.2 / 2100	full-flex	Y	1/8000s	10.0/s	n	Y
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One feature that differentiates the R5 Mark II and the E-1 is in-body image stabilization (IBIS). The R5 Mark II reduces the risk of handshake-induced blur with all attached lenses, while the E-1 offers no blur reduction with lenses that themselves do not provide optical image stabilization.

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 R5 Mark II 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 Canon R5 Mark II has 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.

The R5 Mark II writes its imaging data to CFexpress (type B) or SDXC cards, while the E-1 uses Compact Flash or xD Picture cards. Both cameras feature dual card slots, which can be very useful in case a memory card fails.

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 Canon EOS R5 Mark II and Olympus E-1 and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

Input-Output Connections

		Camera Model	Hotshoe Port	Internal Mic / Speaker	Microphone Port	Headphone Port	HDMI Port	USB Port	WiFi Support	NFC Support	Bluetooth Support
1.		Canon R5 Mark II	Y	mono / mono	Y	Y	full	3.2	Y	-	Y
2.		Olympus E-1	Y	- / -	-	-	-	2.0	-	-	-
3.		Canon R1	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y
4.		Canon R5	Y	mono / mono	Y	Y	micro	3.2	Y	-	Y
5.		Canon R5 C	Y	stereo / mono	Y	Y	micro	3.2	Y	-	Y
6.		Canon R6	Y	mono / mono	Y	Y	micro	3.2	Y	-	Y
7.		Canon R6 Mark II	Y	stereo / mono	Y	Y	micro	3.2	Y	-	Y
8.		Leica Digilux 3	Y	stereo / mono	-	-	-	2.0	-	-	-
9.		Nikon Z8	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y
10.		Olympus E-3	Y	- / -	-	-	-	2.0	-	-	-
11.		Olympus E-5	Y	stereo / -	-	-	mini	2.0	-	-	-
12.		Olympus E-300	Y	- / -	-	-	-	2.0	-	-	-
13.		Olympus E-330	Y	- / -	-	-	-	2.0	-	-	-
14.		Panasonic S1R II	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y
15.		Panasonic S5 II	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y
16.		Sony A1 II	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y
17.		Sony A7R V	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y

It is notable that the R5 Mark II offers wifi support, while the E-1 does not. Wifi can be a very convenient means to transfer image data to an off-camera location.

Both cameras feature a PC Sync terminal to control professional strobe lights, which will be appreciated by studio photographers.

The R5 Mark II is a recent model that features in the current product line-up of Canon. In contrast, the E-1 has been discontinued (but can be found pre-owned on ebay). As a replacement in the same line of cameras, the E-1 was succeeded by the Olympus E-3. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Canon and Olympus websites.

Review summary

So what is the bottom line? Is the Canon R5 Mark II better than the Olympus E-1 or vice versa? A synthesis of the relative strong points of each of the models is listed below.

Arguments in favor of the Canon EOS R5 Mark II:

• More detail: Offers more megapixels (44.8 vs 4.9MP) with a 208% higher linear resolution.
• Better image quality: Features a larger and more technologically advanced imaging sensor.
• Richer colors: The sensor size advantage translates into images with better, more accurate colors.
• More dynamic range: Larger sensor captures a wider spectrum of light and dark details.
• Better low-light sensitivity: Larger sensor produces good images even in poorly lit environments.
• Broader imaging potential: Can record not only still images but also 8k/60p movies.
• Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
• More framing info: Has an electronic viewfinder that displays shooting data.
• Larger viewfinder image: Features a viewfinder with a higher magnification (0.76x vs 0.48x).
• Larger screen: Has a bigger rear LCD (3.2" vs 1.8") for image review and settings control.
• More detailed LCD: Has a higher resolution rear screen (2100k vs 134k dots).
• More flexible LCD: Has a swivel screen for odd-angle shots in portrait or 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 shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
• Faster burst: Shoots at higher frequency (12 vs 3 flaps/sec) to capture the decisive moment.
• Less disturbing: Has an electronic shutter option for completely silent shooting.
• Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
• Easier travel charging: Can be conveniently charged via its USB port.
• Sharper images: Has hand-shake reducing image stabilization built-in.
• More legacy lens friendly: Can take a broad range of non-native lenses via adapters.
• Faster data transfer: Supports a more advanced USB protocol (3.2 vs 2.0).
• Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
• Easier wireless transfer: Supports Bluetooth for image sharing without cables.
• More modern: Reflects 21 years of technical progress since the E-1 launch.

Advantages of the Olympus E-1:

• Brighter framing: Features an optical viewfinder for clear, lag-free composition.
• Longer lasting: Gets more shots (750 versus 340) out of a single battery charge.
• More affordable: Was introduced into a lower priced category (60 percent cheaper at launch).
• More heavily discounted: Has been around for much longer (launched in June 2003).

If the count of relative strengths (bullet points above) is taken as a measure, the R5 Mark II is the clear winner of the match-up (25 : 4 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 wildlife photographer will view the differences between cameras in a way that diverges from the perspective of a family photog, and a person interested in architecture has distinct needs from a sports shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

How about other alternatives? Do the specifications of the Canon R5 Mark II and the Olympus E-1 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 the spec-sheets of cameras can offer a general idea of their imaging potential, it remains incomplete and does no justice, for example, to the way the R5 Mark II or the E-1 perform in practice. At times, user reviews, such as those published at amazon, address these issues in a useful manner, but such feedback is on many occasions incomplete, inconsistent, and unreliable.

Expert reviews

This is why hands-on reviews by experts are important. The adjacent summary-table relays the overall verdicts of several of the most popular 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.

Expert Camera Reviews

		Camera   Model	AP   score	CL   score	DCW   score	DPR   score	EPZ   score	PB   score	Camera Launch	Launch Price	Street Price
1.		Canon R5 Mark II	..	..	..	93/100	..	..	Jul 2024	US$ 4 299	amazon.com
2.		Olympus E-1	..	..	..	+	o	..	Jun 2003	US$ 1 699	ebay.com
3.		Canon R1	..	..	..	..	..	..	Jul 2024	US$ 6 299	amazon.com
4.		Canon R5	4.5/5	+	4/5	91/100	4.5/5	4.5/5	Jul 2020	US$ 3 899	amazon.com
5.		Canon R5 C	..	+ +	..	..	..	..	Jan 2022	US$ 4 499	amazon.com
6.		Canon R6	5/5	+ +	4/5	90/100	4.5/5	5/5	Jul 2020	US$ 2 499	amazon.com
7.		Canon R6 Mark II	5/5	+ +	4.5/5	91/100	4.5/5	5/5	Nov 2022	US$ 2 499	amazon.com
8.		Leica Digilux 3	..	..	..	..	..	..	Sep 2006	US$ 1 499	ebay.com
9.		Nikon Z8	5/5	..	5/5	94/100	5/5	4.5/5	May 2023	US$ 3 999	amazon.com
10.		Olympus E-3	..	88/100	..	+ +	o	4/5	Oct 2007	US$ 1 699	ebay.com
11.		Olympus E-5	4/5	..	..	75/100	4/5	4.5/5	Sep 2010	US$ 1 699	ebay.com
12.		Olympus E-300	..	..	..	+	o	4.5/5	Sep 2004	US$ 799	ebay.com
13.		Olympus E-330	..	..	..	+	o	..	Jan 2006	US$ 999	ebay.com
14.		Panasonic S1R II	..	..	..	..	..	..	May 2025	US$ 3 299	amazon.com
15.		Panasonic S5 II	4.5/5	+ +	5/5	90/100	4.5/5	5/5	Jan 2023	US$ 1 999	amazon.com
16.		Sony A1 II	..	..	..	..	..	..	Nov 2024	US$ 6 499	amazon.com
17.		Sony A7R V	5/5	+ +	4.5/5	92/100	..	..	Oct 2022	US$ 3 899	amazon.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

Care should be taken when interpreting the review scores above, though. The assessments were made in relation to similar cameras of the same technological generation. Hence, a score should always be seen in the context of the camera's market launch date and its price, 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? In case you are interested in seeing how other cameras pair up, just make your choice using the following search menu. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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