When comparing Canon EOS 5D Mark IV vs Canon 5DS / R, the Slant community recommends Canon 5DS / R for most people. In the question“What are the best full frame DSLR cameras?” Canon 5DS / R is ranked 9th while Canon EOS 5D Mark IV is ranked 10th. The most important reason people chose Canon 5DS / R is:
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.
Specs
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Pros
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. In addition, 5 central autofocus points turn into dual-cross-type points with fast (f/2.8 or faster) lenses increasing the precision even further.
Pro In-camera timelapse
Pro Excellent build quality
The 5DS/R has a magnesium alloy shell that makes it durable.
Pro Programmable Auto ISO
Pro Natural skintones
Pro High resolution
50.6 MP compared to 22.3 MP for the 5D Mark III.
Cons
Con Limited video capabilities
No HDMI output, no headphone socket.
Con Dynamic range could be better
According to tests performed by DxOmark 5DS / R has 12.41 stops of dynamic range in print and 11.08 stops on screen for images taken at 100 ISO while cameras in this price range commonly push 14 in print and 13 on screen.
Con Low max ISO
The cameras go up to 6400 (or 12800 in extended) ISO.