Then I ask , in what way? Colors? DR?
1dx is the best Canon camera regarding noise and banding, I have tested 1dx yesterday regarding this issues and compared 1dx against 5dmk2 and 5dmk3, no question, the 1dx was much cleaner in the shadows.
If you then look at other parameters as color sensitivity, DR, tonal range I do not agree
In the only way that matters, I like the product of my work, my keeper rate, plus the percentage of shots in focus. I like the creativity it affords me from sports, landscapes, time exposures, night shooting, indoor events, low ligght shooting. It just does everything better than the other Canons. I miss fewer shots and the frame rate is fantastic for sports and action. You are looking at minutiae when, pardon the pun, you should be looking at the big picture. What good is tonal quality and color sensitivity, etc when you miss the moment? When I had the 1DX for 2 weeks, I didn't spend my time testing it; I used to for my normal shooting and it really made an inpact on what I can produce.