For a pro who wants full frame Nikon is definitely the way to go right now. The D700 is a pro camera. The 5D2 is a high end prosumer camera. The 1D4 isn't full frame, and then 1D4s when it arrives will be horribly expensive. Nikon just works far more often than Canon just works is the general idea.
The general sentiment on the pro forums are Nikon camera/lens combos do things more consistently and reliably than the 5D2 and Canon L lenses. Canon can't even calibrate their lenses properly, the best place to have Canon lenses calibrated is a third party guy called Toshio, but once he's had a camera and lens apparently they work spot on. Nikon gear tends to work out of the box. I know i've had more than more share of gear issues with Canon, but right now I don't want to take the financial hit to sell it and learn a new system.




