I think that the 5D4 will beat the 6D in dynamic range, and slightly edge the 6D in low light /noise performance. IMO the main advantage between the two, besides the 5D4 having higher MP, would be the AF points (61 vs 11) and cross-point AF (11 vs 1), and dual cards.
From the Dxomark data, 6D mark ii is 0.3 stop better in ISO, 1.5 bit better in color depth, similar in dynamic range, comparing to original 6D. I took pictures for the kids, so color depth and ISO make more sense to me. I never push shadow at ISO 100, dynamic range is not important to me.
Canon’s EOS C300 Mark III has 16 stops of dynamic range and shoots up to 120fps 4K Cinema RAW Light. The iPhone 12 Pro boasts more dynamic range than the Canon EOS R5 in iOS beta. Comparing the Canon EOS R, EOS RP, EOS R5 and EOS R6 head-to-head for portraits. Canon 6D Mark II dynamic range results are disappointing
The Canon 6D Mark II is decent in terms of viewfinder and LCD performance, but nothing special. The 5D Mark IV, on the other hand, is firmly a professional camera and it has a viewfinder and LCD to go with that designation. On the 6D Mark II, you get a standard 3” rear LCD, with 1040K dots.
The other 4 cameras all offer usable dynamic range around the 8.4 stop region (the Nikon D700 has a little more highlight range than the 5D Mark II, but the overall range is very close). The original 5D still holds up well 3 years after it was first introduced. As mentioned above, enable Highlight Tone Priority and the 5D Mark II matches the A900.
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canon 6d mark ii vs 5d mark iv dynamic range