My advice is go and try the R. I had 1DX (mk I) and 6D (mk I), which was replaced by R. After 2-3 weeks using I sold also 1DX and bought second R. Reasons?
IQ - I don t have nay problems with - actualy it is really good since I see my exposure in EVF (I m shooting mostly wedding, proms, etc.);
weigth and ergonomics;
AF - simply far better than DX (for my purpose) - I have like 7 L lenses and finally I don t have to do microadjustments and all of them are now tack sharp.
Eye AF works perfectly since last FW.
Only bad thing could be one card slot, but be honest I never had card failure. When I ll experience one, I ll change my mind.
I think, that it is really better than on the paper. But as usually it really depens on user. I can say, that I finally able to make pictures, that I wasn t able to do with previous combo. Like this:
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