Each to their own really.
If you're a Nikon user, you'll want a D4, if you're Canon togger you'll want the 1DX.
I'm a Sony user, so my ideal high end camera would be the Alpha 77, but pricewise that's nowhere near the Nikon D4.
A professional friend of mine has ordered a D4, so I'll see if I can get my hands on it to try sometime.