Canon 1D X Mark III vs Leica S3

The Canon EOS-1D X Mark III and the Leica S3 are two professional cameras that were revealed to the public, respectively, in January 2020 and September 2018. Both are DSLR (Digital Single Lens Reflex) cameras that are based on a full frame (1DX Mark III) and a medium format (S3) sensor. The Canon has a resolution of 20 megapixels, whereas the Leica provides 64 MP.

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

Headline Specifications

Canon 1D X Mark III		Leica S3
Digital single lens reflex		Digital single lens reflex
Canon EF mount lenses		Leica S mount lenses
20 MP – Full Frame sensor		64 MP – Medium Format sensor
4K/60p Video		4K/24p Video
ISO 100-102,400 (50 - 819,200)		ISO 100-50,000
Optical viewfinder		Optical viewfinder
3.2" LCD – 2100k dots		3.0" LCD – 922k dots
Fixed touchscreen		Fixed screen (not touch-sensitive)
20 shutter flaps per second		3 shutter flaps per second
Weathersealed body		Weathersealed body
158 x 168 x 83 mm, 1440 g		160 x 120 x 80 mm, 1260 g

Check 1DX Mark III price at
amazon.com
Check S3 offers at
ebay.com

Going beyond this snapshot of core features and characteristics, what are the differences between the Canon EOS-1D X Mark III and the Leica S3? 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 1D X Mark III and the Leica S3 is provided in the side-by-side display below. The two cameras are presented according to their relative size. Three consecutive views from the front, the top, and the rear side are shown. All width, height and depth 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 Leica S3 is notably smaller (28 percent) than the Canon 1D X Mark III. Moreover, the S3 is markedly lighter (13 percent) than the 1DX Mark III. 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.

Concerning battery life, the 1DX Mark III gets 2850 shots out of its Canon LP-E19 battery, while the S3 can take .. images on a single charge of its Leica BP-PRO1 power pack. As can be seen in the images above, the 1DX Mark III has a battery grip built in. This facilitates image-taking in portrait orientation and gives it additional battery power. In order to provide similar functionality for the S3, Leica provides the Multi-Function Handgrip S vertical grip as an optional accessory (see here on ebay).

The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. If you would like to visualize and compare a different camera combination, you can navigate to the CAM-parator app and make your selection from a broad list of cameras there.

Body Specifications

		Camera Model	Camera Width	Camera Height	Camera Depth	Camera Weight	Battery Life	Weather Sealing	Camera Launch	Launch Price (USD)	Street Price
1.		Canon 1D X Mark III	158 mm	168 mm	83 mm	1440 g	2850	Y	Jan 2020	6,499	amazon.com
2.		Leica S3	160 mm	120 mm	80 mm	1260 g	..	Y	Sep 2018	18,995	ebay.com
3.		Canon 1Ds Mark II	156 mm	158 mm	80 mm	1215 g	1200	Y	Sep 2004	7,999	ebay.com
4.		Canon 1Ds Mark III	150 mm	160 mm	80 mm	1385 g	1800	Y	Aug 2007	7,999	ebay.com
5.		Canon 1D C	158 mm	164 mm	83 mm	1545 g	1120	Y	Apr 2012	14,999	ebay.com
6.		Canon 1D X	158 mm	168 mm	83 mm	1551 g	1120	Y	Oct 2011	6,799	ebay.com
7.		Canon 1D X Mark II	158 mm	168 mm	83 mm	1530 g	1210	Y	Feb 2016	5,999	ebay.com
8.		Canon 5D Mark II	152 mm	114 mm	75 mm	850 g	850	Y	Sep 2008	3,499	ebay.com
9.		Canon 5D Mark III	152 mm	116 mm	76 mm	950 g	950	Y	Mar 2012	3,499	ebay.com
10.		Canon 6D	145 mm	111 mm	71 mm	770 g	1090	Y	Sep 2012	2,099	ebay.com
11.		Canon R3	150 mm	143 mm	87 mm	1015 g	760	Y	Sep 2021	5,999	amazon.com
12.		Leica M10	139 mm	80 mm	39 mm	660 g	210	Y	Jan 2017	6,595	ebay.com
13.		Leica S2	160 mm	120 mm	80 mm	1410 g	..	Y	Sep 2008	22,995	ebay.com
14.		Leica S Typ 006	160 mm	120 mm	80 mm	1260 g	..	Y	Sep 2012	21,950	ebay.com
15.		Leica S-E Typ 006	160 mm	120 mm	80 mm	1260 g	..	Y	Sep 2014	16,900	ebay.com
16.		Leica S Typ 007	160 mm	120 mm	80 mm	1260 g	..	Y	Sep 2014	24,490	ebay.com
17.		Nikon D6	160 mm	163 mm	92 mm	1270 g	3580	Y	Feb 2020	6,499	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

The price is, of course, an important factor in any camera decision. The manufacturer’s suggested retail prices give an idea on the placement of the camera in the maker’s lineup and the broader market. The 1DX Mark III was launched at a markedly lower price (by 66 percent) than the S3, 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. 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 imaging sensor is a crucial determinant of image quality. A large sensor will generally have larger individual pixels that offer better low-light sensitivity, provide wider dynamic range, and have richer color-depth than smaller pixels in a sensor of the same technological generation. Further, a large sensor camera will give the photographer additional creative options when using shallow depth-of-field to isolate a subject from its background. On the downside, larger sensors tend to be more expensive and lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Canon 1D X Mark III features a full frame sensor and the Leica S3 a medium format sensor. The sensor area in the S3 is 56 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.0 and 0.8. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

With 64MP, the S3 offers a higher resolution than the 1DX Mark III (20MP), but the S3 has smaller individual pixels (pixel pitch of 4.59μm versus 6.57μm for the 1DX Mark III). It is noteworthy in this context that the 1DX Mark III is a somewhat more recent model (by 1 year and 3 months) than the S3, and its sensor might have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixel-units. Coming back to sensor resolution, it should be mentioned that the S3 has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

The resolution advantage of the Leica S3 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the S3 for good quality output (200 dots per inch) amounts to 49 x 32.7 inches or 124.5 x 83 cm, for very good quality (250 dpi) 39.2 x 26.1 inches or 99.6 x 66.4 cm, and for excellent quality (300 dpi) 32.7 x 21.8 inches or 83 x 55.3 cm. The corresponding values for the Canon 1D X Mark III are 27.4 x 18.2 inches or 69.5 x 46.3 cm for good quality, 21.9 x 14.6 inches or 55.6 x 37.1 cm for very good quality, and 18.2 x 12.2 inches or 46.3 x 30.9 cm for excellent quality prints.

The 1DX Mark III has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

The Canon EOS-1D X Mark III has a native sensitivity range from ISO 100 to ISO 102400, which can be extended to ISO 50-819200. The corresponding ISO settings for the Leica S3 are ISO 100 to ISO 50000 (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.

For many cameras, data on sensor performance has been reported by DXO Mark. 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"). The adjacent table reports on the physical sensor characteristics and the outcomes of the DXO sensor quality tests for a sample of comparator-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 1D X Mark III	Full Frame	20.0	5472	3648	4K/60p	24.2	14.5	3248	91
2.		Leica S3	Medium Format	64.0	9800	6533	4K/24p	25.6	14.4	3143	98
3.		Canon 1Ds Mark II	Full Frame	16.6	4992	3328	none	23.3	11.3	1480	74
4.		Canon 1Ds Mark III	Full Frame	21.0	5616	3744	none	24.0	12.0	1663	80
5.		Canon 1D C	Full Frame	17.9	5184	3456	4K/24p	24.3	13.0	2155	85
6.		Canon 1D X	Full Frame	17.9	5184	3456	1080/30p	23.8	11.8	2786	82
7.		Canon 1D X Mark II	Full Frame	20.0	5472	3648	4K/60p	24.1	13.5	3207	88
8.		Canon 5D Mark II	Full Frame	21.0	5616	3744	1080/30p	23.7	11.9	1815	79
9.		Canon 5D Mark III	Full Frame	22.1	5760	3840	1080/30p	24.0	11.7	2293	81
10.		Canon 6D	Full Frame	20.0	5472	3648	1080/30p	23.8	12.1	2340	82
11.		Canon R3	Full Frame	24.0	6000	4000	6K/60p	25.0	14.7	4086	96
12.		Leica M10	Full Frame	23.8	5952	3992	none	24.4	13.2	2133	86
13.		Leica S2	Medium Format	37.5	7500	5000	none	23.9	12.5	2224	82
14.		Leica S Typ 006	Medium Format	37.5	7500	5000	none	23.9	12.2	824	76
15.		Leica S-E Typ 006	Medium Format	37.5	7500	5000	none	25.1	13.7	2763	93
16.		Leica S Typ 007	Medium Format	37.5	7500	5000	4K/24p	25.1	13.7	2763	93
17.		Nikon D6	Full Frame	20.7	5568	3712	4K/30p	25.3	14.3	2886	95
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 two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the 1DX Mark III provides a higher frame rate than the S3. It can shoot video footage at 4K/60p, while the Leica is limited to 4K/24p.

Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. The 1DX Mark III and the S3 are similar in the sense that both have an optical viewfinder. The latter is useful for getting a clear image for framing even in brightly lit environments. The viewfinder in the 1DX Mark III offers a wider field of view (100%) than the one in the S3 (98%), so that a larger proportion of the captured image is visible in the finder. On the other hand, the viewfinder of the S3 has a higher magnification (0.87x vs 0.76x), so that the size of the image transmitted appears closer to the size seen with the naked human eye. The following table reports on some other key feature differences and similarities of the Canon 1D X Mark III, the Leica S3, and comparable cameras.

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 1D X Mark III	optical	Y	3.2 / 2100	fixed	Y	1/8000s	20.0/s	n	n
2.		Leica S3	optical	Y	3.0 / 922	fixed	n	1/4000s	3.0/s	n	n
3.		Canon 1Ds Mark II	optical	Y	2.0 / 230	fixed	n	1/8000s	4.0/s	n	n
4.		Canon 1Ds Mark III	optical	Y	3.0 / 230	fixed	n	1/8000s	5.0/s	n	n
5.		Canon 1D C	optical	Y	3.2 / 1040	fixed	n	1/8000s	14.0/s	n	n
6.		Canon 1D X	optical	Y	3.2 / 1040	fixed	n	1/8000s	14.0/s	n	n
7.		Canon 1D X Mark II	optical	Y	3.2 / 1620	fixed	Y	1/8000s	16.0/s	n	n
8.		Canon 5D Mark II	optical	Y	3.0 / 920	fixed	n	1/8000s	3.9/s	n	n
9.		Canon 5D Mark III	optical	Y	3.2 / 1040	fixed	n	1/8000s	6.0/s	n	n
10.		Canon 6D	optical	Y	3.0 / 1040	fixed	n	1/4000s	4.5/s	n	n
11.		Canon R3	5760	Y	3.2 / 4150	swivel	Y	1/8000s	12.0/s	n	Y
12.		Leica M10	optical	n	3.0 / 1037	fixed	n	1/4000s	5.0/s	n	n
13.		Leica S2	optical	Y	3.0 / 460	fixed	n	1/4000s	1.5/s	n	n
14.		Leica S Typ 006	optical	Y	3.0 / 922	fixed	n	1/4000s	1.5/s	n	n
15.		Leica S-E Typ 006	optical	Y	3.0 / 922	fixed	n	1/4000s	1.5/s	n	n
16.		Leica S Typ 007	optical	Y	3.0 / 922	fixed	n	1/4000s	3.5/s	n	n
17.		Nikon D6	optical	Y	3.2 / 2359	fixed	Y	1/8000s	14.0/s	n	n
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 1DX Mark III has a touchscreen, while the S3 has a conventional panel. Touch control can be particularly helpful, for example, for setting the focus point.

The Canon 1D X Mark III 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 1DX Mark III writes its imaging data to CFexpress (type B) cards, while the S3 uses Compact Flash or SDXC 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-1D X Mark III and Leica S3 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 1D X Mark III	Y	mono / mono	Y	Y	mini	3.1	Y	-	Y
2.		Leica S3	Y	stereo / mono	Y	Y	mini	3.0	Y	-	-
3.		Canon 1Ds Mark II	Y	- / -	-	-	-	2.0	-	-	-
4.		Canon 1Ds Mark III	Y	mono / -	-	-	-	2.0	-	-	-
5.		Canon 1D C	Y	mono / mono	Y	Y	mini	2.0	-	-	-
6.		Canon 1D X	Y	mono / -	Y	-	mini	2.0	-	-	-
7.		Canon 1D X Mark II	Y	mono / mono	Y	Y	mini	3.0	-	-	-
8.		Canon 5D Mark II	Y	mono / mono	Y	-	mini	2.0	-	-	-
9.		Canon 5D Mark III	Y	mono / mono	Y	Y	mini	2.0	-	-	-
10.		Canon 6D	Y	mono / mono	Y	-	mini	2.0	Y	-	-
11.		Canon R3	Y	stereo / mono	Y	Y	micro	3.2	Y	-	Y
12.		Leica M10	Y	- / -	-	-	-	-	Y	-	-
13.		Leica S2	Y	- / -	-	-	mini	2.0	-	-	-
14.		Leica S Typ 006	Y	- / -	-	-	mini	2.0	-	-	-
15.		Leica S-E Typ 006	Y	- / -	-	-	mini	2.0	-	-	-
16.		Leica S Typ 007	Y	stereo / mono	Y	Y	mini	3.0	Y	-	-
17.		Nikon D6	Y	stereo / mono	Y	Y	mini	3.1	Y	-	Y

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

Travel and landscape photographers will find it useful that both cameras feature internal geolocalization sensors and can record GPS coordinates in their EXIF data.

The 1DX Mark III is a recent model that features in the current product line-up of Canon. In contrast, the S3 has been discontinued (but can be found pre-owned on ebay). There has not been a direct replacement model for the S3 from Leica. Further information on the features and operation of the 1DX Mark III and S3 can be found, respectively, in the Canon 1D X Mark III Manual (free pdf) or the online Leica S3 Manual.

Review summary

So how do things add up? Is the Canon 1D X Mark III better than the Leica S3 or vice versa? The listing below highlights the relative strengths of the two models.

Reasons to prefer the Canon EOS-1D X Mark III:

• Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
• Better video: Provides higher movie framerates (4K/60p versus 4K/24p).
• Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
• More complete view: Has a viewfinder with a larger field of view (100% vs 98%).
• Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review and settings control.
• More detailed LCD: Has a higher resolution rear screen (2100k vs 922k dots).
• Fewer buttons to press: Is equipped with a touch-sensitive rear screen to facilitate handling.
• Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
• Faster burst: Shoots at higher frequency (20 vs 3 flaps/sec) to capture the decisive moment.
• Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
• More portrait friendly: Features an integrated vertical grip for easier portrait shooting.
• Easier wireless transfer: Supports Bluetooth for image sharing without cables.
• More affordable: Was introduced into a lower priced category (66 percent cheaper at launch).
• More modern: Is somewhat more recent (announced 1 year and 3 months after the S3).

Arguments in favor of the Leica S3:

• More detail: Has more megapixels (64 vs 20MP), which boosts linear resolution by 79%.
• Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
• Larger viewfinder image: Features a viewfinder with a higher magnification (0.87x vs 0.76x).
• More compact: Is smaller (160x120mm vs 158x168mm) and will fit more readily into a bag.
• Less heavy: Has a lower weight (by 180g or 12 percent) and is thus easier to take along.
• More prestigious: Has the Leica luxury appeal, which ensures a high resale value.
• More heavily discounted: Has been on the market for longer (launched in September 2018).

If the count of relative strengths (bullet points above) is taken as a measure, the 1DX Mark III is the clear winner of the match-up (14 : 7 points). However, the relative importance of the various individual camera aspects will vary according to personal preferences and needs, so that you might like to apply corresponding weights to the particular features before making a decision 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.

How about other alternatives? Do the specifications of the Canon 1D X Mark III and the Leica S3 place the cameras among the top in their class? Find out in the latest Best DSLR 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 1DX Mark III or the S3 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 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.

Expert Camera Reviews

		Camera   Model	AP   score	CL   score	DCW   score	DPR   score	EPZ   score	PB   score	Camera Launch	Launch Price (USD)	Street Price
1.		Canon 1D X Mark III	..	+ +	5/5	..	4.5/5	4/5	Jan 2020	6,499	amazon.com
2.		Leica S3	..	..	..	..	..	..	Sep 2018	18,995	ebay.com
3.		Canon 1Ds Mark II	..	..	..	+ +	..	..	Sep 2004	7,999	ebay.com
4.		Canon 1Ds Mark III	..	..	..	+ +	4.5/5	..	Aug 2007	7,999	ebay.com
5.		Canon 1D C	..	..	..	..	..	..	Apr 2012	14,999	ebay.com
6.		Canon 1D X	5/5	..	..	..	4.5/5	4.5/5	Oct 2011	6,799	ebay.com
7.		Canon 1D X Mark II	..	..	4.5/5	89/100	4.5/5	4.5/5	Feb 2016	5,999	ebay.com
8.		Canon 5D Mark II	4/5	91/100	..	79/100	4/5	..	Sep 2008	3,499	ebay.com
9.		Canon 5D Mark III	..	+ +	..	82/100	4.5/5	4.5/5	Mar 2012	3,499	ebay.com
10.		Canon 6D	5/5	+ +	..	83/100	4.5/5	4.5/5	Sep 2012	2,099	ebay.com
11.		Canon R3	5/5	o	4.5/5	..	5/5	4.5/5	Sep 2021	5,999	amazon.com
12.		Leica M10	4.5/5	..	..	..	4/5	4.5/5	Jan 2017	6,595	ebay.com
13.		Leica S2	..	..	..	..	..	..	Sep 2008	22,995	ebay.com
14.		Leica S Typ 006	..	..	..	..	..	..	Sep 2012	21,950	ebay.com
15.		Leica S-E Typ 006	..	..	..	..	..	..	Sep 2014	16,900	ebay.com
16.		Leica S Typ 007	4/5	..	..	..	..	..	Sep 2014	24,490	ebay.com
17.		Nikon D6	..	..	4/5	..	4.5/5	4.5/5	Feb 2020	6,499	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 comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.

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Other camera comparisons

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