When comparing Canon EOS-1D X Mark II vs Canon EOS 5D Mark III, the Slant community recommends Canon EOS 5D Mark III for most people. In the question“What are the best full frame DSLR cameras?” Canon EOS 5D Mark III is ranked 6th while Canon EOS-1D X Mark II is ranked 7th. The most important reason people chose Canon EOS 5D Mark III is:
61-point autofocus system with 41 cross-type points that performs well in low light.
Specs
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Pros
Pro Excellent continuous drive
The camera can shoot 14fps RAW without any limitations and 16fps with a locked up mirror. The buffer holds 170 RAW frames at 14fps while JPG buffer is unlimited.
Pro Flicker detection
The camera can detect flickering light sources and sync up with them to shoot at peak brightness in order to avoid underexposing the image by accident.
Pro Good autofocus system
61-point autofocus system with 41 cross-type points that performs well in low light.
Pro Complete manual control for video
Shutter, aperture and ISO can be set manually for video.
Pro Excellent ergonomics
Pro Excellent build quality
Cons
Con Not yet available
The camera's planned release date is April 2016.
Con The camera is showing its age
5D Mark III was released in 2012.
Con Dynamic range could be better
5D Mark III has 11.7 stops of dynamic range while competitors have around 14 stops. And shadow recovery is lacking as well limiting HDR photos further.
Con AF point coverage is restricting
Layout of AF points restricts to compose shots in a certain way.
Con Lacks continuous AF in movie mode
Con Lacks programmable Auto ISO
Con Can't set arbitrary exposure time
Con AF points don't illuminate in Servo mode
It can be difficult to see AF points in low light as they do not illuminate in Servo mode.