I think the DR of the D4 look better than the 5d2, and less chroma noise, but this is purley my opinion, not done anything to test them in the same setting at all. Just wanted to point that out. And over 1600 the D4 is better.
YES, I am buying a 1d X, man, I'm really annoyed by these comments and even threads of people asking me if I can afford to get a 1d X ... If you want I'll post a copy of my bankstatement if you care so damn much if I have the money or not, I'll be VERY sure to post a picture of me, my 1d X, the receipt with my name AND that days newspaper when it arrives, just to shut you up.