As a person who owns both, I find the Nikon to be far superior in terms of noise performance at high ISO settings and focus tracking during high speed bursts, among other things.
hmmmm that's why the large majority of sports photographers use Canon 1DX, right? They all must be stupid to use an inferior machine...... come on!
The 1Dx is superior in most things except for, and I agree with the ISO. but fps is faster, tracking is really good... I thought focus tracking on the D4 was worse than the 1Dx.