Below you can see the front view size comparison of Canon 1D X II and Nikon D4s. Canon 1D X II is 2mm narrower and 8mm thinner than Nikon D4s but it is also 11mm taller.
Canon 1D X II vs Nikon D4s - Front View
Canon 1D X II vs Nikon D4s - Top View
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.
Camera Size Comparison
Select Two Cameras for Size Comparison