Upload & Sell: On
As a D4 owner, I'm curious what real world results are like. On paper, it looks like I'll keep my D4 and wait till the D5 comes out, but so many times things that seem like small upgrades actually end up being quite impressive in the end.
For example, Nikon claims faster AF lock on - this is a big deal for birds in flight. Sometimes a fast bird swoops in quickly and you only have a couple seconds before the action is over. In these cases I know I've personally had more than a few instances where the D4 just could not achieve a lock, even with having the sensor right on the bird. Of course, most of the time it's not a problem, but just saying, there's always room for improvement depending on what you shoot.
So, I'm going to wait and see what happens in the real world before completely dismissing the camera out of hand.