Sony A7 II versus Olympus E-M10 II
The Sony Alpha A7 II and the Olympus OM-D E-M10 Mark II are two digital cameras that were revealed to the public, respectively, in November 2014 and August 2015. Both the A7 II and the E-M10 II are mirrorless interchangeable lens cameras that are based on a full frame (A7 II) and a Four Thirds (E-M10 II) sensor. The Sony has a resolution of 24 megapixel, whereas the Olympus provides 15.9 MP. Read on to find out how these two cameras compare with respect to their size, their sensors, their features, and their reception by expert reviewers.
Body comparison: Sony A7 II vs Olympus E-M10 II
An illustration of the physical size and weight of the Sony A7 II and the Olympus E-M10 II is provided in the side-by-side display below. Three consecutive views from the front, the top, and the rear side are shown. All size dimensions are rounded to the nearest millimeter. You can also use the toggle button to switch to a percentage comparison if you prefer that the measures are being expressed in relative terms (in this case, the camera on the left side – the A7 II – represents the basis for the calculations across all the size and weight measures).
If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Olympus E-M10 II is notably smaller (18 percent) than the Sony A7 II. Moreover, the E-M10 II is substantially lighter (35 percent) than the A7 II. It is worth mentioning in this context that the A7 II is splash and dust resistant, while the E-M10 II 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. A larger imaging sensor will tend to go along with bigger and heavier lenses, although exceptions exist. You can find an overview of optics for the two cameras in the Sony FE Lens Catalog (A7 II) and the Micro Four Thirds Lens Catalog (E-M10 II). 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.
The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. If you want to switch the focus of the display and review another camera pair, just select a new right or left comparator from among the camera models in the table. Alternatively, you can also move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.
|Camera Body Specifications|
|Sony A7 II»||127 mm||96 mm||60 mm||599 g||350||Y||Nov 2014||1,999||-|
|Olympus E-M10 II«||120 mm||83 mm||47 mm||390 g||320||n||Aug 2015||799||-|
|Olympus E-M10 III« »||122 mm||84 mm||50 mm||410 g||330||n||Aug 2017||649|
|Olympus E-M1 II« »||134 mm||91 mm||67 mm||574 g||440||Y||Sep 2016||1,999|
|Olympus E-PL8« »||115 mm||67 mm||38 mm||357 g||350||n||Sep 2016||549||-|
|Olympus E-PL7« »||115 mm||67 mm||38 mm||357 g||350||n||Aug 2014||599||-|
|Olympus E-M10« »||119 mm||82 mm||46 mm||396 g||320||n||Jan 2014||699||-|
|Panasonic GX80« »||122 mm||71 mm||44 mm||426 g||290||n||Apr 2016||799|
|Sony A7 III« »||127 mm||96 mm||74 mm||650 g||610||Y||Feb 2018||1,999|
|Sony A9« »||127 mm||96 mm||63 mm||673 g||650||Y||Apr 2017||4,499|
|Sony A7R III« »||127 mm||96 mm||74 mm||650 g||650||Y||Oct 2017||3,199|
|Sony A7R II« »||127 mm||96 mm||60 mm||625 g||290||Y||Jun 2015||3,199||-|
|Sony A7S II« »||127 mm||96 mm||60 mm||627 g||370||Y||Sep 2015||2,999|
|Sony A77 II« »||143 mm||104 mm||81 mm||647 g||480||Y||May 2014||1,199|
|Sony A7« »||127 mm||94 mm||48 mm||474 g||340||Y||Oct 2013||1,699||-|
|Sony A7R« »||127 mm||94 mm||48 mm||465 g||340||Y||Oct 2013||2,299||-|
|Sony A77« »||143 mm||104 mm||81 mm||732 g||470||Y||Aug 2011||1,999||-|
The price is, of course, an important factor in any camera decision. The listed launch prices provide an indication of the market segment that the manufacturer of the cameras have been targeting. The E-M10 II was launched at a markedly lower price (by 60 percent) than the A7 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. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.
Sensor comparison: Sony A7 II vs Olympus E-M10 II
The size of the imaging sensor is a crucial determinant 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 tend to be more expensive and lead to bigger and heavier cameras and lenses.
Of the two cameras under consideration, the Sony A7 II features a full frame sensor and the Olympus E-M10 II a Four Thirds sensor. The sensor area in the E-M10 II 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 A7 II has a native 3:2 aspect ratio, while the one in the E-M10 II offers a 4:3 aspect.
With 24MP, the A7 II offers a higher resolution than the E-M10 II (15.9MP), but the A7 II nevertheless has larger individual pixels (pixel pitch of 5.97μm versus 3.76μm for the E-M10 II) due to its larger sensor. However, the E-M10 II is a somewhat more recent model (by 9 months) than the A7 II, and its sensor might have benefitted from technological advances during this time that enhance the light gathering capacity of its pixels. Coming back to sensor resolution, it should be mentioned that the E-M10 II has no anti-alias filter installed, so that it can capture all the detail its sensor resolves.
Consistent information on actual sensor performance is available from DXO Mark for most cameras. 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"). Of the two cameras under review, the A7 II provides substantially higher image quality than the E-M10 II, with an overall score that is 17 points higher. This advantage is based on 1.8 bits higher color depth, 1.1 EV in additional dynamic range, and 1.5 stops in additional low light sensitivity. The following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.
|Sony A7 II»||Full Frame||24.0||6000||4000||1080/60p||24.9||13.6||2449||90|
|Olympus E-M10 II«||Four Thirds||15.9||4608||3456||1080/60p||23.1||12.5||842||73|
|Olympus E-M10 III« »||Four Thirds||15.9||4608||3456||4K/30p||-||-||-||-|
|Olympus E-M1 II« »||Four Thirds||20.2||5184||3888||4K/30p||23.7||12.8||1312||80|
|Olympus E-PL8« »||Four Thirds||15.9||4608||3456||1080/30p||-||-||-||-|
|Olympus E-PL7« »||Four Thirds||15.9||4608||3456||1080/30p||22.7||12.4||873||72|
|Olympus E-M10« »||Four Thirds||15.9||4608||3456||1080/30p||22.8||12.3||884||72|
|Panasonic GX80« »||Four Thirds||15.8||4592||3448||4K/30p||22.9||12.6||662||71|
|Sony A7 III« »||Full Frame||24.0||6000||4000||4K/30p||25.0||14.7||3730||96|
|Sony A9« »||Full Frame||24.0||6000||4000||4K/30p||24.9||13.3||3517||92|
|Sony A7R III« »||Full Frame||42.2||7952||5304||4K/30p||26.0||14.7||3523||100|
|Sony A7R II« »||Full Frame||42.2||7952||5304||4K/30p||26.0||13.9||3434||98|
|Sony A7S II« »||Full Frame||12.0||4240||2832||4K/30p||23.6||13.3||2993||85|
|Sony A77 II« »||APS-C||24.0||6000||4000||1080/60p||-||-||-||-|
|Sony A7« »||Full Frame||24.0||6000||4000||1080/60p||24.8||14.2||2248||90|
|Sony A7R« »||Full Frame||36.2||7360||4912||1080/60p||25.6||14.1||2746||95|
|Sony A77« »||APS-C||24.0||6000||4000||1080/60p||24.0||13.2||801||78|
Many modern cameras cannot only take still pictures, but also record videos. The two cameras under consideration both have sensors whose read-out speed is fast enough to capture moving pictures, and both provide the same movie specifications (1080/60p).
Feature comparison: Sony A7 II vs Olympus E-M10 II
Apart from 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 A7 II offers a slightly higher resolution than the one in the E-M10 II (2400k vs 2360k dots). The table below summarizes some of the other core capabilities of the Sony A7 II and Olympus E-M10 II in connection with corresponding information for a sample of similar cameras. The full specs-sheets can be found in the camera manual or, for example, in the dpreview camera hub.
|Sony A7 II»||2400||n||3.0||1230||tilting||n||8000||5.0||n||Y|
|Olympus E-M10 II«||2360||n||3.0||1040||tilting||Y||4000||8.0||Y||Y|
|Olympus E-M10 III« »||2360||n||3.0||1040||tilting||Y||4000||8.6||Y||Y|
|Olympus E-M1 II« »||2360||n||3.0||1037||swivel||Y||8000||18.0||n||Y|
|Olympus E-PL8« »||-||n||3.0||1037||tilting||Y||4000||8.0||n||Y|
|Olympus E-PL7« »||-||n||3.0||1037||tilting||Y||4000||8.0||n||Y|
|Olympus E-M10« »||1440||n||3.0||1037||tilting||Y||4000||8.0||Y||Y|
|Panasonic GX80« »||2765||n||3.0||1040||tilting||Y||4000||8.0||Y||Y|
|Sony A7 III« »||2359||n||3.0||922||tilting||Y||8000||10.0||n||Y|
|Sony A9« »||3686||n||3.0||1440||tilting||Y||8000||20.0||n||Y|
|Sony A7R III« »||3686||n||3.0||1440||tilting||Y||8000||10.0||n||Y|
|Sony A7R II« »||2400||n||3.0||1229||tilting||n||8000||5.0||n||Y|
|Sony A7S II« »||2400||n||3.0||1229||tilting||n||8000||5.0||n||Y|
|Sony A77 II« »||2359||Y||3.0||1229||full-flex||n||8000||12.0||Y||Y|
|Sony A7« »||2400||n||3.0||1230||tilting||n||8000||5.0||n||n|
|Sony A7R« »||2400||n||3.0||1230||tilting||n||8000||4.0||n||n|
|Sony A77« »||2359||Y||3.0||921||full-flex||n||8000||12.0||Y||Y|
Both the A7 II and the E-M10 II have been discontinued, but can regularly be found used on eBay. The A7 II was replaced by the Sony A7 III, while the E-M10 II was followed by the Olympus E-M10 III.
Review summary: Sony A7 II vs Olympus E-M10 II
So what is the bottom line? Is there a clear favorite between the Sony A7 II and the Olympus E-M10 II? The listing below highlights the relative strengths of the two models.
Advantages of the Sony Alpha A7 II:
- More detail: Offers more megapixels (24 vs 15.9MP) with a 25% higher linear resolution.
- Better moiré control: Has an anti-alias filter to avoid artificial patterns to appear in images.
- Better image quality: Scores substantially higher (17 points) in the DXO overall assessment.
- Richer colors: Generates images with noticeably better colors (1.8 bits more color depth).
- More dynamic range: Captures a larger spectrum of light and dark details (1.1 EV of extra DR).
- Better low-light sensitivity: Requires less light for good images (1.5 stops ISO advantage).
- More detailed LCD: Has a higher resolution rear screen (1230k vs 1040k dots).
- Faster shutter: Has higher mechanical shutter speed (8000/sec vs 4000/sec) to freeze action.
- Better sealing: Is weather sealed to enable shooting in dusty or wet environments.
- More heavily discounted: Has been on the market for longer (launched in November 2014).
Reasons to prefer the Olympus OM-D E-M10 Mark II:
- Maximized detail: Lacks an anti-alias filter to exploit the sensor's full resolution potential.
- Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
- Faster burst: Shoots at higher frequency (8 vs 5 flaps/sec) to capture the decisive moment.
- More compact: Is smaller (120x83mm vs 127x96mm) and will fit more readily into a bag.
- Less heavy: Has a lower weight (by 209g or 35 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 (60 percent cheaper at launch).
- More modern: Was introduced somewhat (9 months) more recently.
If the count of individual advantages (bullet points above) is taken as a guide, the A7 II emerges as the winner of the contest (10 : 8 points). However, the pertinence of the various camera strengths will differ across photographers, so that you might want to weigh individual camera traits according to their importance for your own imaging needs before making a camera decision.
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 A7 II or the E-M10 II handle or 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. This is where reviews by experts come in. The adjacent table relays the overall verdicts of several of the most popular camera review sites (cameralabs, dpreview, ephotozine, imaging-resource, photographyblog). The detailed reviews can be accessed by clicking on the site logo in the table header.
|Sony A7 II»||Rec||82/100||4.5/5||5/5||5/5||Nov 2014||1,999||-|
|Olympus E-M10 II«||HiRec||80/100||5/5||5/5||5/5||Aug 2015||799||-|
|Olympus E-M10 III« »||Rec||80/100||4.5/5||-||4.5/5||Aug 2017||649|
|Olympus E-M1 II« »||HiRec||85/100||4.5/5||5/5||4.5/5||Sep 2016||1,999|
|Olympus E-PL8« »||-||-||4.5/5||-||4/5||Sep 2016||549||-|
|Olympus E-PL7« »||Rec||-||5/5||4.5/5||4/5||Aug 2014||599||-|
|Olympus E-M10« »||-||80/100||5/5||4.5/5||5/5||Jan 2014||699||-|
|Panasonic GX80« »||HiRec||82/100||5/5||4.5/5||5/5||Apr 2016||799|
|Sony A7 III« »||HiRec||89/100||5/5||-||5/5||Feb 2018||1,999|
|Sony A9« »||HiRec||89/100||5/5||5/5||5/5||Apr 2017||4,499|
|Sony A7R III« »||HiRec||90/100||4.5/5||5/5||5/5||Oct 2017||3,199|
|Sony A7R II« »||HiRec||90/100||5/5||4.5/5||5/5||Jun 2015||3,199||-|
|Sony A7S II« »||Rec||-||4.5/5||5/5||5/5||Sep 2015||2,999|
|Sony A77 II« »||-||80/100||4.5/5||4/5||5/5||May 2014||1,199|
|Sony A7« »||HiRec||80/100||5/5||4.5/5||5/5||Oct 2013||1,699||-|
|Sony A7R« »||HiRec||82/100||4.5/5||5/5||5/5||Oct 2013||2,299||-|
|Sony A77« »||91/100||81/100||-||4.5/5||5/5||Aug 2011||1,999||-|
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 comparisons of ratings among very different cameras or across long time periods have little meaning. Also, please note that some of the review sites have changed their methodology and reporting over time.
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