Leica SL3-S vs Nikon Z6 III

The Leica SL3-S and the Nikon Z6 III are two enthusiast cameras that were announced, respectively, in January 2025 and June 2024. Both the Leica SL3-S and the Z6 III are mirrorless interchangeable lens cameras that are equipped with a full frame sensor. The Leica has a resolution of 24 megapixels, whereas the Nikon provides 24.3 MP.

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

Headline Specifications

Leica SL3-S		Nikon Z6 III
Mirrorless system camera		Mirrorless system camera
Leica L mount lenses		Nikon Z mount lenses
24 MP – Full Frame sensor		24.3 MP – Full Frame sensor
6K/30p Video		6K/60p Video
ISO 100-50,000 (50 - 100,000)		ISO 100-64,000 (50 - 204,800)
Electronic viewfinder (5760k dots)		Electronic viewfinder (5760k dots)
3.2" LCD – 2333k dots		3.2" LCD – 2100k dots
Tilting touchscreen		Swivel touchscreen
30 shutter flaps per second		14 shutter flaps per second
In-body stabilization		In-body stabilization
Weathersealed body		Weathersealed body
315 shots per battery charge		380 shots per battery charge
141 x 108 x 85 mm, 852 g		139 x 102 x 74 mm, 670 g

Check Leica SL3-S price at
amazon.com
Check Z6 III price at
amazon.com

Going beyond this snapshot of core features and characteristics, what are the differences between the Leica SL3-S and the Nikon Z6 III? 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

The side-by-side display below illustrates the physical size and weight of the Leica SL3-S and the Nikon Z6 III. 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 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 Nikon Z6 III is notably smaller (7 percent) than the Leica SL3-S. Moreover, the Z6 III is markedly lighter (21 percent) than the Leica SL3-S. 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 Leica SL3-S gets 315 shots out of its Leica BP-SCL6 battery, while the Z6 III can take 380 images on a single charge of its Nikon EN-EL15c power pack. The battery packs of both cameras can be charged via USB, which can be very convenient when travelling.

The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. 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.		Leica SL3-S	141 mm	108 mm	85 mm	852 g	315	Y	Jan 2025	US$ 5 299	amazon.com
2.		Nikon Z6 III	139 mm	102 mm	74 mm	670 g	380	Y	Jun 2024	US$ 2 499	amazon.com
3.		Canon R1	158 mm	150 mm	87 mm	1115 g	1330	Y	Jul 2024	US$ 6 299	amazon.com
4.		Canon R3	150 mm	143 mm	87 mm	1015 g	760	Y	Sep 2021	US$ 5 999	amazon.com
5.		Leica SL2	146 mm	107 mm	42 mm	953 g	370	Y	Nov 2019	US$ 5 999	amazon.com
6.		Leica SL2-S	146 mm	107 mm	83 mm	931 g	510	Y	Dec 2020	US$ 4 899	amazon.com
7.		Leica SL3	141 mm	108 mm	85 mm	854 g	320	Y	Mar 2024	US$ 6 999	amazon.com
8.		Nikon Z5	134 mm	101 mm	67 mm	675 g	470	Y	Jul 2020	US$ 1 399	ebay.com
9.		Nikon Z5 II	134 mm	101 mm	72 mm	700 g	330	Y	Apr 2025	US$ 1 699	amazon.com
10.		Nikon Z6	134 mm	101 mm	67 mm	675 g	310	Y	Aug 2018	US$ 1 999	ebay.com
11.		Nikon Z6 II	134 mm	101 mm	70 mm	705 g	410	Y	Oct 2020	US$ 1 999	amazon.com
12.		Nikon Zf	144 mm	103 mm	49 mm	710 g	380	Y	Sep 2023	US$ 1 999	amazon.com
13.		Panasonic S1 II	134 mm	102 mm	92 mm	800 g	350	Y	May 2025	US$ 3 199	amazon.com
14.		Panasonic S5	133 mm	98 mm	82 mm	714 g	440	Y	Sep 2020	US$ 1 999	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 A9 III	136 mm	97 mm	83 mm	702 g	530	Y	Nov 2023	US$ 5 999	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 manufacturer’s suggested retail prices give an idea on the placement of the camera in the maker’s lineup and the broader market. The Z6 III was launched at a markedly lower price (by 53 percent) than the Leica SL3-S, 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. 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. 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 are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.

Both cameras under consideration feature a full frame sensor, but their sensors differ slightly in size. The sensor area in the Z6 III is 1 percent smaller. They nevertheless have the same format factor of 1.0. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Despite having a slightly smaller sensor, the Z6 III offers a slightly higher resolution of 24.3 megapixels, compared with 24 MP of the Leica SL3-S. This megapixels advantage comes at the cost of a higher pixel density and a smaller size of the individual pixel (with a pixel pitch of 5.94μm versus 6.00μm for the Leica SL3-S). Moreover, it should be noted that the Leica SL3-S is a somewhat more recent model (by 7 months) than the Z6 III, and its sensor might have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixels. Coming back to sensor resolution, it should be mentioned that the Leica SL3-S has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.

Both cameras have the capacity to capture high quality composite images by combining multiple shots after shifting the sensor by miniscule distances. This multi-shot, pixel-shift mode is most suitable for photography of stationary objects (landscapes, studio scenes).

The Leica SL3-S has a native sensitivity range from ISO 100 to ISO 50000, which can be extended to ISO 50-100000. The corresponding ISO settings for the Nikon Z6 III are ISO 100 to ISO 64000, with the possibility to increase the ISO range to 50-204800.

In terms of underlying technology, the Leica SL3-S is build around a CMOS sensor, while the Z6 III uses a BSI-CMOS 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 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 following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.

Sensor Characteristics

		Camera Model	Sensor Class	Resolution (MP)	Horiz. Pixels	Vert. Pixels	Video Format	DXO Portrait	DXO Landscape	DXO Sports	DXO Overall
1.		Leica SL3-S	Full Frame	24.0	6000	4000	6K/30p	25.4	14.8	3383	97
2.		Nikon Z6 III	Full Frame	24.3	6048	4024	6K/60p	25.4	14.8	3318	97
3.		Canon R1	Full Frame	24.0	6000	4000	6K/60p	25.4	14.8	3332	97
4.		Canon R3	Full Frame	24.0	6000	4000	6K/60p	25.0	14.7	4086	96
5.		Leica SL2	Full Frame	46.7	8368	5584	4K/60p	25.3	14.3	2866	95
6.		Leica SL2-S	Full Frame	24.0	6000	4000	4K/60p	25.2	14.1	3504	95
7.		Leica SL3	Full Frame	60.3	9520	6336	8K/30p	25.4	14.8	3295	97
8.		Nikon Z5	Full Frame	24.2	6016	4016	4K/30p	25.3	14.3	2929	95
9.		Nikon Z5 II	Full Frame	24.4	6048	4032	4K/60p	25.4	14.8	3398	97
10.		Nikon Z6	Full Frame	24.3	6048	4024	4K/30p	25.3	14.3	3299	95
11.		Nikon Z6 II	Full Frame	24.3	6048	4024	4K/60p	25.0	14.4	3303	94
12.		Nikon Zf	Full Frame	24.3	6048	4024	4K/60p	25.4	14.7	3243	96
13.		Panasonic S1 II	Full Frame	24.0	6000	4000	6K/30p	25.4	14.8	3406	97
14.		Panasonic S5	Full Frame	24.0	6000	4000	4K/60p	25.1	14.5	2697	94
15.		Panasonic S5 II	Full Frame	24.0	6000	4000	6K/30p	25.4	14.6	3158	96
16.		Sony A9 III	Full Frame	24.0	6000	4000	4K/120p	25.4	14.7	3243	96
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. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, but the Leica SL3-S provides a higher video resolution than the Z6 III. It can shoot video footage at 6K/30p, while the Nikon is limited to 6K/60p.

Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. The Leica SL3-S and the Z6 III are similar in the sense that both feature an electronic viewfinder, which is helpful when framing images in bright sunlight. Moreover, their viewfinders offer an identical resolution of 5760k dots. The table below summarizes some of the other core capabilities of the Leica SL3-S and Nikon Z6 III in connection with corresponding information for a sample of similar 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.		Leica SL3-S	5760	Y	3.2 / 2333	tilting	Y	1/8000s	30.0/s	n	Y
2.		Nikon Z6 III	5760	Y	3.2 / 2100	swivel	Y	1/8000s	14.0/s	n	Y
3.		Canon R1	9440	Y	3.2 / 2100	swivel	Y	1/8000s	12.0/s	n	Y
4.		Canon R3	5760	Y	3.2 / 4150	swivel	Y	1/8000s	12.0/s	n	Y
5.		Leica SL2	5760	Y	3.2 / 2100	fixed	Y	1/8000s	10.0/s	n	Y
6.		Leica SL2-S	5760	Y	3.2 / 2100	fixed	Y	1/8000s	20.0/s	n	Y
7.		Leica SL3	5760	Y	3.2 / 2333	tilting	Y	1/8000s	5.0/s	n	Y
8.		Nikon Z5	3690	n	3.2 / 1040	tilting	Y	1/8000s	4.5/s	n	Y
9.		Nikon Z5 II	3690	n	3.2 / 2100	swivel	Y	1/8000s	14.0/s	n	Y
10.		Nikon Z6	3690	Y	3.2 / 2100	tilting	Y	1/8000s	12.0/s	n	Y
11.		Nikon Z6 II	3690	Y	3.2 / 2100	tilting	Y	1/8000s	14.0/s	n	Y
12.		Nikon Zf	3690	n	3.2 / 2100	swivel	Y	1/8000s	14.0/s	n	Y
13.		Panasonic S1 II	5760	n	3.2 / 1840	full-flex	Y	1/8000s	10.0/s	n	Y
14.		Panasonic S5	2360	n	3.0 / 1840	swivel	Y	1/8000s	7.0/s	n	Y
15.		Panasonic S5 II	3680	n	3.0 / 1840	swivel	Y	1/8000s	9.0/s	n	Y
16.		Sony A9 III	9440	n	3.2 / 2100	full-flex	Y	1/80000s	120.0/s	n	Y
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

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 Leica SL3-S and the Nikon Z6 III 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 Leica SL3-S and the Z6 III write their files to CFexpress (type B) or SDXC cards. Both cameras feature dual card slots, which can be very useful in case a memory card fails. Both cameras support UHS-II cards, which provide for Ultra High Speed data transfer of up to 312 MB/s.

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 Leica SL3-S and Nikon Z6 III 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.		Leica SL3-S	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y
2.		Nikon Z6 III	Y	stereo / mono	Y	Y	micro	3.2	Y	-	Y
3.		Canon R1	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y
4.		Canon R3	Y	stereo / mono	Y	Y	micro	3.2	Y	-	Y
5.		Leica SL2	Y	stereo / mono	Y	Y	full	3.1	Y	-	Y
6.		Leica SL2-S	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y
7.		Leica SL3	Y	stereo / mono	Y	Y	full	3.1	Y	-	Y
8.		Nikon Z5	Y	stereo / mono	Y	Y	micro	3.2	Y	-	Y
9.		Nikon Z5 II	Y	stereo / mono	Y	Y	micro	3.2	Y	-	Y
10.		Nikon Z6	Y	stereo / mono	Y	Y	micro	3.1	Y	-	Y
11.		Nikon Z6 II	Y	stereo / mono	Y	Y	micro	3.2	Y	-	Y
12.		Nikon Zf	Y	stereo / mono	Y	Y	micro	3.2	Y	-	Y
13.		Panasonic S1 II	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y
14.		Panasonic S5	Y	stereo / mono	Y	Y	micro	3.2	Y	-	Y
15.		Panasonic S5 II	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y
16.		Sony A9 III	Y	stereo / mono	Y	Y	full	3.2	Y	-	Y

Both the Leica SL3-S and the Z6 III are recent models that are part of the current product line-up. The Z6 III replaced the earlier Nikon Z6 II, while the Leica SL3-S followed on from the Leica SL2-S. Further information on the two cameras (e.g. user guides, manuals), as well as related accessories, can be found on the official Leica and Nikon websites.

Review summary

So what is the bottom line? Is there a clear favorite between the Leica SL3-S and the Nikon Z6 III? Which camera is better? The listing below highlights the relative strengths of the two models.

Reasons to prefer the Leica SL3-S:

• Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
• Better video: Provides higher definition movie capture (6K/30p vs 6K/60p).
• More detailed LCD: Has a higher resolution rear screen (2333k vs 2100k dots).
• Faster burst: Shoots at higher frequency (30 vs 14 flaps/sec) to capture the decisive moment.
• More solid recording: Has a full-sized HDMI port for a sturdy connection to an external recorder.
• More prestigious: Has the Leica luxury appeal, which ensures a high resale price.
• More modern: Is somewhat more recent (announced 7 months after the Z6 III).

Advantages of the Nikon Z6 III:

• Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
• Larger viewfinder image: Features a viewfinder with a higher magnification (0.80x vs 0.76x).
• 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.
• Less heavy: Has a lower weight (by 182g or 21 percent) and is thus easier to take along.
• Longer lasting: Gets more shots (380 versus 315) out of a single battery charge.
• 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 June 2024).

If the number of relative strengths (bullet points above) is taken as a guide, the Z6 III comes out slightly ahead of the Leica SL3-S (8 : 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.

How about other alternatives? Do the specifications of the Leica SL3-S and the Nikon Z6 III 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 comparison of technical specifications can provide a useful overview of the capabilities of different cameras, it says little about, for example, the shooting experience and imaging performance of the Leica SL3-S and the Z6 III in practical situations. 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 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	Street Price
1.		Leica SL3-S	..	..	..	..	..	..	Jan 2025	US$ 5 299	amazon.com
2.		Nikon Z6 III	..	..	..	..	..	..	Jun 2024	US$ 2 499	amazon.com
3.		Canon R1	..	..	..	..	..	..	Jul 2024	US$ 6 299	amazon.com
4.		Canon R3	5/5	o	4.5/5	..	5/5	4.5/5	Sep 2021	US$ 5 999	amazon.com
5.		Leica SL2	4/5	..	4.5/5	..	4.5/5	4/5	Nov 2019	US$ 5 999	amazon.com
6.		Leica SL2-S	4/5	..	4/5	..	4.5/5	4.5/5	Dec 2020	US$ 4 899	amazon.com
7.		Leica SL3	..	..	4.5/5	..	..	4.5/5	Mar 2024	US$ 6 999	amazon.com
8.		Nikon Z5	4/5	..	4/5	89/100	4.5/5	4/5	Jul 2020	US$ 1 399	ebay.com
9.		Nikon Z5 II	..	..	..	..	..	..	Apr 2025	US$ 1 699	amazon.com
10.		Nikon Z6	5/5	..	5/5	89/100	4.5/5	5/5	Aug 2018	US$ 1 999	ebay.com
11.		Nikon Z6 II	4.5/5	..	4/5	89/100	4.5/5	4.5/5	Oct 2020	US$ 1 999	amazon.com
12.		Nikon Zf	4.5/5	..	4.5/5	90/100	4.5/5	5/5	Sep 2023	US$ 1 999	amazon.com
13.		Panasonic S1 II	..	..	..	..	..	..	May 2025	US$ 3 199	amazon.com
14.		Panasonic S5	4.5/5	+ +	4.5/5	88/100	4.5/5	4.5/5	Sep 2020	US$ 1 999	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 A9 III	4.5/5	..	..	91/100	..	..	Nov 2023	US$ 5 999	amazon.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

The above review scores should be interpreted with care, though. The assessments were made in relation to similar cameras of the same technological generation. 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. It should also be noted that some of the review sites have over time altered the way they render their verdicts.

Check Leica SL3-S price at
amazon.com
Check Z6 III price at
amazon.com

Other camera comparisons

Did this review help to inform your camera decision process? In case you would like to check on the differences and similarities of other camera models, just use the search menu below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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Check Leica SL3-S price at
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Check Z6 III price at
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