Eric, high ISO/low noise is the critical characteristic to me.
I read what you've said, but I've looked at the photos Yvan has given us links for, and I see noise in them, that while it's not bad, in my opinion, it's not as good as the D700.
It's for this reason, that I still am having a hard time deciding D4 or D800. I have both on order. This decision is made even more difficult by the speed of shooting differential. With the grip I get a consistent 8 fps on my D700, both slower than the D4 for wildlife shooting.
On the other hand the cropping ability with 36MPs to work with is amazing with the D800.
Do you have any suggestions to help me figure this out? I've got a D700 which will expire pretty soon and can only justify one camera purchase, the D4 or the D800. Clearly the D4 is better at high ISO/low noise than the D800, but ... it it better enough.