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".
Canon 5D Mark III vs. Fuji X100S image quality 09 January 2014. Canon 5D Mk III vs. LEICA M 240 vs. Sony A7 Image Quality Comparison 19 December 2013. Canon 6D. Similar image quality smaller, lighter package with a few less controls, but with added Wi-Fi and GPS. Canon 5D Mark III versus Canon 6D.
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.
Canon EOS 6D Mark II vs EOS 5D Mark IV: Performance. Canon EOS 6D Mk2: 45 point AF system (all cross-type) Canon EOS 5D Mk4: 61 point AF system (41 cross-type)
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