Leica Q3 vs Olympus E-M10 IV

The Leica Q3 and the Olympus OM-D E-M10 Mark IV are two digital cameras that were officially introduced, respectively, in May 2023 and August 2020. The Q3 is a fixed lens compact, while the E-M10 IV is a mirrorless interchangeable lens camera. The cameras are based on a full frame (Q3) and a Four Thirds (E-M10 IV) sensor. The Leica has a resolution of 60.3 megapixels, whereas the Olympus provides 20.2 MP.

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

Headline Specifications

Leica Q3		Olympus E-M10 IV
Fixed lens compact camera		Mirrorless system camera
28mm f/1.7		Micro Four Thirds lenses
60.3 MP – Full Frame sensor		20.2 MP – Four Thirds sensor
8K/30p Video		4K/30p Video
ISO 50-100,000		ISO 200-25,600
Electronic viewfinder (5760k dots)		Electronic viewfinder (2360k dots)
3.0" LCD – 1840k dots		3.0" LCD – 1040k dots
Tilting touchscreen		Tilting touchscreen
15 shutter flaps per second		15 shutter flaps per second
Lens-based stabilization		In-body stabilization
Weathersealed body		not weather sealed
350 shots per battery charge		360 shots per battery charge
130 x 80 x 93 mm, 743 g		122 x 84 x 49 mm, 383 g

Check Q3 price at
amazon.com
Check E-M10 IV price at
amazon.com

Going beyond this snapshot of core features and characteristics, what are the differences between the Leica Q3 and the Olympus OM-D E-M10 Mark IV? 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 physical size and weight of the Leica Q3 and the Olympus E-M10 IV are illustrated 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 size dimensions are rounded to the nearest millimeter.

The E-M10 IV can be obtained in two different colors (black, silver), while the Q3 is only available in black.

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Olympus E-M10 IV is somewhat smaller (1 percent) than the Leica Q3. It is worth mentioning in this context that the Q3 is splash and dust resistant, while the E-M10 IV does not feature any corresponding weather-sealing.

The above size and weight comparisons are to some extent incomplete and possibly misleading, as the Q3 has a lens built in, whereas the E-M10 IV is an interchangeable lens camera that requires a separate lens. Attaching the latter will add extra weight and bulk to the setup. You can compare the optics available for the E-M10 IV and their specifications in the Micro Four Thirds Lens Catalog.

Concerning battery life, the Q3 gets 350 shots out of its Leica BP-SCL6 battery, while the E-M10 IV can take 360 images on a single charge of its Olympus BLS-50 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. 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 Q3	130 mm	80 mm	93 mm	743 g	350	Y	May 2023	EUR 5 999	amazon.com
2.		Olympus E-M10 IV	122 mm	84 mm	49 mm	383 g	360	n	Aug 2020	EUR 699	amazon.com
3.		Fujifilm GFX 50S	148 mm	94 mm	91 mm	740 g	400	Y	Sep 2016	EUR 6 499	ebay.com
4.		Hasselblad X1D II	148 mm	97 mm	70 mm	766 g	..	Y	Jun 2019	EUR 5 999	ebay.com
5.		Leica M Typ 240	139 mm	80 mm	42 mm	680 g	500	Y	Sep 2012	EUR 6 199	ebay.com
6.		Leica M Typ 262	139 mm	80 mm	42 mm	680 g	400	Y	Nov 2015	EUR 5 499	ebay.com
7.		Leica M10	139 mm	80 mm	39 mm	660 g	210	Y	Jan 2017	EUR 6 499	ebay.com
8.		Leica M11	139 mm	80 mm	39 mm	640 g	700	Y	Jan 2022	EUR 8 349	amazon.com
9.		Leica Q2	130 mm	80 mm	92 mm	718 g	370	Y	Mar 2019	EUR 4 799	amazon.com
10.		Leica SL3	141 mm	108 mm	85 mm	769 g	320	Y	Mar 2024	EUR 6 799	amazon.com
11.		Leica X-U Typ 113	140 mm	79 mm	88 mm	635 g	450	Y	Jan 2016	EUR 3 249	ebay.com
12.		Olympus E-M10	119 mm	82 mm	46 mm	396 g	320	n	Jan 2014	EUR 599	ebay.com
13.		Olympus E-M10 II	120 mm	83 mm	47 mm	390 g	320	n	Aug 2015	EUR 599	ebay.com
14.		Olympus E-M10 III	122 mm	84 mm	50 mm	410 g	330	n	Aug 2017	EUR 649	ebay.com
15.		Olympus E-P7	118 mm	69 mm	38 mm	337 g	360	n	Jun 2021	EUR 799	amazon.com
16.		Olympus E-PL10	117 mm	68 mm	39 mm	380 g	350	n	Oct 2019	EUR 599	ebay.com
17.		Zeiss ZX1	142 mm	93 mm	46 mm	800 g	250	n	Sep 2018	EUR 5 999	ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
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Any camera decision will naturally be influenced heavily by the price. The retail prices at the time of the camera’s release place the model in the market relative to other models in the producer’s line-up and the competition. 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 sensor inside a digital camera is one of the key determinants 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 are more costly to manufacture and tend to lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Leica Q3 features a full frame sensor and the Olympus E-M10 IV a Four Thirds sensor. The sensor area in the E-M10 IV 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 Q3 has a native 3:2 aspect ratio, while the one in the E-M10 IV offers a 4:3 aspect.

With 60.3MP, the Q3 offers a higher resolution than the E-M10 IV (20.2MP), but the Q3 nevertheless has larger individual pixels (pixel pitch of 3.79μm versus 3.34μm for the E-M10 IV) due to its larger sensor. Moreover, the Q3 is a much more recent model (by 2 years and 9 months) than the E-M10 IV, and its sensor will 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 neither of the two cameras has an anti-alias filter installed, so they are able to capture all the detail the sensor resolves.

The resolution advantage of the Leica Q3 implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the Q3 for good quality output (200 dots per inch) amounts to 47.6 x 31.6 inches or 121 x 80.4 cm, for very good quality (250 dpi) 38.1 x 25.3 inches or 96.8 x 64.3 cm, and for excellent quality (300 dpi) 31.8 x 21.1 inches or 80.7 x 53.6 cm. The corresponding values for the Olympus E-M10 IV are 25.9 x 19.4 inches or 65.8 x 49.4 cm for good quality, 20.7 x 15.6 inches or 52.7 x 39.5 cm for very good quality, and 17.3 x 13 inches or 43.9 x 32.9 cm for excellent quality prints.

The Q3 has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

The Leica Q3 has a native sensitivity range from ISO 50 to ISO 100000. The corresponding ISO settings for the Olympus OM-D E-M10 Mark IV 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.

For many cameras, data on sensor performance has been reported by DXO Mark. 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 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.		Leica Q3	Full Frame	60.3	9528	6328	8K/30p	25.4	14.7	3216	96
2.		Olympus E-M10 IV	Four Thirds	20.2	5184	3888	4K/30p	23.3	13.2	1402	76
3.		Fujifilm GFX 50S	Medium Format	51.1	8256	6192	1080/30p	25.4	14.1	2977	96
4.		Hasselblad X1D II	Medium Format	51.3	8272	6200	1080/25p	25.7	14.5	3234	99
5.		Leica M Typ 240	Full Frame	23.7	5952	3976	1080/25p	24.0	13.3	1860	84
6.		Leica M Typ 262	Full Frame	23.7	5952	3976	none	24.8	13.7	2478	90
7.		Leica M10	Full Frame	23.8	5952	3992	none	24.4	13.2	2133	86
8.		Leica M11	Full Frame	60.3	9528	6328	none	26.3	14.8	3376	100
9.		Leica Q2	Full Frame	46.7	8368	5584	4K/30p	26.4	13.5	2491	96
10.		Leica SL3	Full Frame	60.3	9520	6336	8K/30p	25.4	14.8	3295	97
11.		Leica X-U Typ 113	APS-C	16.1	4928	3264	1080/30p	23.8	13.0	1614	80
12.		Olympus E-M10	Four Thirds	15.9	4608	3456	1080/30p	22.8	12.3	884	72
13.		Olympus E-M10 II	Four Thirds	15.9	4608	3456	1080/60p	23.1	12.5	842	73
14.		Olympus E-M10 III	Four Thirds	15.9	4608	3456	4K/30p	23.1	12.8	1120	74
15.		Olympus E-P7	Four Thirds	20.2	5184	3888	4K/30p	23.4	13.3	1494	77
16.		Olympus E-PL10	Four Thirds	15.9	4608	3456	4K/30p	23.3	13.1	1324	76
17.		Zeiss ZX1	Full Frame	37.4	7488	4992	4K/30p	25.2	14.1	2759	94
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. Both cameras under consideration have a sensor with sufficiently fast read-out times for moving pictures, but the Q3 provides a higher video resolution than the E-M10 IV. It can shoot video footage at 8K/30p, while the Olympus is limited to 4K/30p.

Feature comparison

Beyond body and sensor, cameras can and do differ across a range of features. The two cameras under consideration are similar with respect to both having an electronic viewfinder. However, the one in the Q3 offers a substantially higher resolution than the one in the E-M10 IV (5760k vs 2360k dots). The adjacent table lists some of the other core features of the Leica Q3 and Olympus E-M10 IV 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.		Leica Q3	5760	n	3.0 / 1840	tilting	Y	1/2000s	15.0/s	n	Y
2.		Olympus E-M10 IV	2360	n	3.0 / 1040	tilting	Y	1/4000s	15.0/s	Y	Y
3.		Fujifilm GFX 50S	optional	Y	3.2 / 2360	full-flex	Y	1/4000s	3.0/s	n	n
4.		Hasselblad X1D II	3690	n	3.6 / 2360	fixed	Y	1/2000s	2.7/s	n	n
5.		Leica M Typ 240	optical	n	3.0 / 920	fixed	n	1/4000s	3.0/s	n	n
6.		Leica M Typ 262	optical	n	3.0 / 921	fixed	n	1/4000s	3.0/s	n	n
7.		Leica M10	optical	n	3.0 / 1037	fixed	n	1/4000s	5.0/s	n	n
8.		Leica M11	optical	n	3.0 / 2333	fixed	Y	1/4000s	4.5/s	n	n
9.		Leica Q2	3680	n	3.0 / 1040	fixed	Y	1/2000s	10.0/s	n	Y
10.		Leica SL3	5760	Y	3.2 / 2333	tilting	Y	1/8000s	5.0/s	n	Y
11.		Leica X-U Typ 113	optional	n	3.0 / 920	fixed	n	1/2000s	5.0/s	Y	n
12.		Olympus E-M10	1440	n	3.0 / 1037	tilting	Y	1/4000s	8.0/s	Y	Y
13.		Olympus E-M10 II	2360	n	3.0 / 1040	tilting	Y	1/4000s	8.0/s	Y	Y
14.		Olympus E-M10 III	2360	n	3.0 / 1040	tilting	Y	1/4000s	8.6/s	Y	Y
15.		Olympus E-P7	none	n	3.0 / 1040	tilting	Y	1/4000s	8.7/s	Y	Y
16.		Olympus E-PL10	none	n	3.0 / 1040	tilting	Y	1/4000s	8.6/s	Y	Y
17.		Zeiss ZX1	6221	n	4.3 / 2765	fixed	Y	1/1000s	3.0/s	n	n
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 E-M10 IV has one, while the Q3 does not. While the built-in flash of the E-M10 IV is not very powerful, it can at times be useful as a fill-in light.

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 Q3 and the Olympus E-M10 IV 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 Q3 and the E-M10 IV write their files to SDXC cards. 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 Q3 and Olympus OM-D E-M10 Mark IV 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 Q3	Y	stereo / mono	-	-	micro	3.1	Y	-	Y
2.		Olympus E-M10 IV	Y	stereo / mono	-	-	micro	2.0	Y	-	Y
3.		Fujifilm GFX 50S	Y	stereo / mono	Y	Y	micro	3.0	Y	-	-
4.		Hasselblad X1D II	Y	stereo / mono	Y	Y	-	3.0	Y	-	-
5.		Leica M Typ 240	Y	stereo / mono	-	-	-	2.0	-	-	-
6.		Leica M Typ 262	Y	- / -	-	-	-	2.0	-	-	-
7.		Leica M10	Y	- / -	-	-	-	-	Y	-	-
8.		Leica M11	Y	- / -	-	-	-	3.2	Y	-	Y
9.		Leica Q2	Y	stereo / mono	-	-	-	-	Y	-	Y
10.		Leica SL3	Y	stereo / mono	Y	Y	full	3.1	Y	-	Y
11.		Leica X-U Typ 113	Y	stereo / mono	-	-	-	2.0	-	-	-
12.		Olympus E-M10	Y	stereo / mono	-	-	micro	2.0	Y	-	-
13.		Olympus E-M10 II	Y	stereo / mono	-	-	micro	2.0	Y	-	-
14.		Olympus E-M10 III	Y	stereo / mono	-	-	micro	2.0	Y	-	-
15.		Olympus E-P7	Y	stereo / mono	-	-	micro	2.0	Y	-	Y
16.		Olympus E-PL10	Y	stereo / mono	-	-	micro	2.0	Y	-	Y
17.		Zeiss ZX1	Y	stereo / mono	-	-	-	3.1	Y	Y	Y

Both the Q3 and the E-M10 IV are recent models that are part of the current product line-up. The E-M10 IV replaced the earlier Olympus E-M10 III, while the Q3 followed on from the Leica Q2. Further information on the features and operation of the Q3 and E-M10 IV can be found, respectively, in the Leica Q3 Manual (free pdf) or the online Olympus E-M10 IV Manual.

Review summary

So how do things add up? Which of the two cameras – the Leica Q3 or the Olympus E-M10 IV – has the upper hand? Is one clearly better than the other? Below is a summary of the relative strengths of each of the two contestants.

Advantages of the Leica Q3:

• More detail: Offers more megapixels (60.3 vs 20.2MP) with a 77% 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.
• Better video: Provides higher definition movie capture (8K/30p vs 4K/30p).
• Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
• More detailed viewfinder: Has higher resolution electronic viewfinder (5760k vs 2360k dots).
• Larger viewfinder image: Features a viewfinder with a higher magnification (0.79x vs 0.62x).
• More detailed LCD: Has a higher resolution rear screen (1840k vs 1040k dots).
• Ready to shoot: Has a lens built-in, whereas the E-M10 IV requires a separate lens.
• 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).
• More prestigious: Has the Leica luxury appeal, which ensures a high resale price.
• More modern: Reflects 2 years and 9 months of technical progress since the E-M10 IV launch.

Arguments in favor of the Olympus OM-D E-M10 Mark IV:

• More selfie-friendly: Has an articulated screen that can be turned to be front-facing.
• Faster shutter: Has higher mechanical shutter speed (1/4000s vs 1/2000s) to freeze action.
• More flexible: Takes interchangeable lenses and can thus be used with specialty optics.
• Easier fill-in: Has a small integrated flash to brighten shadows of backlit subjects.
• More heavily discounted: Has been around for much longer (launched in August 2020).

If the number of relative strengths (bullet points above) is taken as a guide, the Q3 is the clear winner of the match-up (15 : 5 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 sports photographer will view the differences between cameras in a way that diverges from the perspective of a street photog, and a person interested in family portraits has distinct needs from a landscape shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

How about other alternatives? Do the specifications of the Leica Q3 and the Olympus E-M10 IV place the cameras among the top in their class? Find out in the latest Best Prime Lens Compact Camera and Best Mirrorless Interchangeable Lens 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 Q3 or the E-M10 IV perform in practice. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.

Expert reviews

This is where reviews by experts come in. 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 Q3	5/5	..	4.5/5	..	..	4.5/5	May 2023	EUR 5 999	amazon.com
2.		Olympus E-M10 IV	4.5/5	..	5/5	81/100	4.5/5	4.5/5	Aug 2020	EUR 699	amazon.com
3.		Fujifilm GFX 50S	..	..	4.5/5	85/100	5/5	4.5/5	Sep 2016	EUR 6 499	ebay.com
4.		Hasselblad X1D II	..	..	4/5	..	4/5	4/5	Jun 2019	EUR 5 999	ebay.com
5.		Leica M Typ 240	4/5	..	..	..	4/5	..	Sep 2012	EUR 6 199	ebay.com
6.		Leica M Typ 262	..	..	..	..	..	..	Nov 2015	EUR 5 499	ebay.com
7.		Leica M10	4.5/5	..	..	..	4/5	4.5/5	Jan 2017	EUR 6 499	ebay.com
8.		Leica M11	4.5/5	..	4.5/5	..	4.5/5	4.5/5	Jan 2022	EUR 8 349	amazon.com
9.		Leica Q2	..	..	4.5/5	84/100	4.5/5	4/5	Mar 2019	EUR 4 799	amazon.com
10.		Leica SL3	..	..	4.5/5	..	..	4.5/5	Mar 2024	EUR 6 799	amazon.com
11.		Leica X-U Typ 113	3.5/5	..	..	..	..	3.5/5	Jan 2016	EUR 3 249	ebay.com
12.		Olympus E-M10	4/5	..	..	80/100	5/5	5/5	Jan 2014	EUR 599	ebay.com
13.		Olympus E-M10 II	4.5/5	+ +	..	80/100	5/5	5/5	Aug 2015	EUR 599	ebay.com
14.		Olympus E-M10 III	..	+	5/5	80/100	4.5/5	4.5/5	Aug 2017	EUR 649	ebay.com
15.		Olympus E-P7	4/5	..	4.5/5	..	..	4.5/5	Jun 2021	EUR 799	amazon.com
16.		Olympus E-PL10	..	..	4/5	77/100	..	4/5	Oct 2019	EUR 599	ebay.com
17.		Zeiss ZX1	3/5	..	..	83/100	4/5	4/5	Sep 2018	EUR 5 999	ebay.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. A score, therefore, has to be seen in close connection to the price and market introduction time of the camera, and rating-comparisons among cameras that span long time periods or concern very differently equipped models make little sense. 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

Did this review help to inform your camera decision process? In case you are interested in seeing how other cameras pair up, just make a corresponding selection in the search boxes 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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