When comparing Sony a7R II vs Olympus OM-D E-M10 Mark II, the Slant community recommends Sony a7R II for most people. In the question“What are the best mirrorless cameras?” Sony a7R II is ranked 3rd while Olympus OM-D E-M10 Mark II is ranked 4th. The most important reason people chose Sony a7R II is:
The camera has a 42MP BSI-CMOS sensor. Both in good light and low light, whether you're shooting in RAW or JPEG, the images have excellent detail. You can check out detailed studio tests over at [DPReview](http://www.dpreview.com/reviews/sony-alpha-7r-ii/5).
Ranked in these QuestionsQuestion Ranking
Pro Excellent image quality
The camera has a 42MP BSI-CMOS sensor. Both in good light and low light, whether you're shooting in RAW or JPEG, the images have excellent detail. You can check out detailed studio tests over at DPReview.
Pro Great Auto ISO implementation
Pro In-body image stabilization
Pro Good 4K video
The camera can capture 4K30 (at up to 100Mbps), 1080p60 and 720p120 video internally and save to XAVC S with S-Log2 color profile. The video is detailed with little noise both in good light and in low light.
It's worth noting that 4K video is slightly better when shooting using the Super 35 region of the sensor instead of the full sensor region while 1080p performs better when shot at full width of the sensor and downsampled.
Pro The camera can be used while it's charging over USB
Pro Good AF for video
Camera's autofocus is fast and decisive. And it allows a good degree of control over how it behaves. You can adjust the focusing speed as well as sensitivity.
Pro Face detection AF for video
Pro Good video shooting tools
The camera has a zebra and focus peaking tools allowing you to monitor focus and exposure while shooting.
Pro Flat color profile for video
Pro Has a completely silent mode
If set up to use electronic shutter, the camera makes zero noise.
Pro Excellent AF point coverage
399 phase-detect AF points and additional 25 contrast-detect AF points.
Pro Excellent continuous AF
Both in good light and in low light.
Pro Good noise reduction control
Pro Flat color profile available for increased dynamic range
A flat color profile captures footage in low contrast and higher dynamic range allowing for easier color grading in post-production.
Pro Great dynamic range
Pro Excellent low-light capabilities
The camera has class-leading high ISO capabilities. A look at real-world high ISO shots can be found here.
Pro Great focusing system
The focusing system is quick, it rarely if ever resorts to focus hunting and it's consistently accurate.
Pro In-body stabilization saves money on lenses
Since stabilization can be applied to any lense, you can save money by not having to spend it on stabilized lenses which are generally more expensive than non-stabilized lenses.
Pro MFT lens mount allows for a wide variety of lenses to choose from
Micro Four Thirds system is a standard used by Panasonic, Olympus, Sigma and many others so you're not locked into a having to buy lenses from one manufacturer.
Con Cumbersome menu system
The camera has a plethora of poorly organized menu items.
Con Continuous shooting is limited to 5fps
With 5 frames per second the camera lags behind other cameras. If you're looking to shoot sports, this camera might not be the best choice.
Con Limited selection of native lenses
Sony has a comparatively little selection of lenses and while you can add an adapter to use lenses from other manufacturers, that choice comes at the expense of some functionality.
Con Screen is not touch sensitive
Switching AF points could be simplified by having a touchscreen.
Con Poor battery life
Con Lacks in-camera RAW conversion
Con Continuous shooting is at a reduced dynamic range
Con Eye-AF and Lock-on AF is not available for 3rd party lenses
Con Eye-AF and Lock-on AF is not available in video
Con Lacks direct control over autofocus points
Con Menu system could be easier to use
The camera menu has 26 screen pages and dozens of subpages. Navigating through them to find what you need, can take a while.