What makes the 5D Mark IV better in terms of autofocus capabilities is that this camera has 61 focus points while the 6D Mark II has only 45 focus points. On the other hand, only 41 AF points in the 5D Mark IV are capable of being cross-type, while all of them can become cross type in the 6D Mark II.
-4K crop: the 1dx mk ii has a 4k crop factor of 1.3x, whereas the 5D mark iv has a 4k crop factor of 1.74x or something-120fps: the 1dx mk ii can do this at 1080p, while the 5d mark ii can only do this at 720p . As I currently shoot 1080p for clients that are ok with DSLR-level image quality, the 5D mark iv looks great to me.

While the 5D Mark IV has the specifications that create marginally higher-quality images and videos, the 6D Mark II features more modern controls and options that contribute to ease of use. Which of the two cameras to get really depends on how much time and effort you invest into photography or filmmaking.

I wouldn't bother with the 5D II and its fixed pattern banding, the 5D III is good but doesn't have the 5D's look, and the 6D has the best image quality by far of those three but it's not the same look as the 5D, only the Mark II N has that look I know you want.
Finally, the Canon EOS 6D Mark II sports a vari-angle touchscreen LCD, which is great for photographing pets. You’re able to adjust the screen and easily capture lower angles without hurting your back in the process! 2. Canon EOS 5D Mark IV. Image from Amazon. Canon EOS 5D Mark IV.
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".
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canon 6d mark ii vs 5d mark iv image quality