All Canon using pro's are feeling rather smug about the 1DX when compared to the D4.where did you get that idea/info?
Simple - where have you had Nikon pros jumping for joy with the D4?
Heck Joe Mcnally's launch blurb produced nothing that any one could get excited about.
Most with D3s's for weddings etc. are not even bothering to upgrade!
Canon guys on the other hand have got a camera that comfortably claims the Pro model crown. Which part of the 1DX improvements are not beneficial? 61pt AF? ISO to 51k? 12FPS? Gbit Ethernet? Dual CF? Duplication of controls for portrait and landscape mode? Video improvements?
The only issue is the moving from APS-H to FF, and for most users that will end up becoming a minor adjustment in real world terms.