Yet, they knew that image quality is the #1 selling point, so they couldn't market it with, "Same image quality with better AF and lots of tweaks." Instead of making improvements to the sensor hardware, they increased the noise reduction in JPEG processing and allowed two stops higher ISO--equivalent to pushing a 5D2's "H2".
Tough question here. The 5D series is definitely a better choice for video and faster shooting opportunities. And the Mark IV is better than the Mark III for those specific reasons. But in terms of image quality all will be very good. The Mark III and 6D are comparable in terms of IQ, but the Mark IV is ahead of both of them.
Unfortunately, the 6D Mark II has a worse dynamic range than the Mark I. The Canon 6D Mark II has worst dynamic range than the previous 6D and only matches the 2008 Canon 5D Mark II. Credit
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canon 6d mark ii vs 5d mark iv image quality
