Upload & Sell: Off
im with Gary, just for the higher fps of the D4, there is no way i could go back to a low resolution camera now. The resolution available on the D800 is staggering with great glass like the 500 and 600 lenses. I dont tend to think of it as a cropping machine, but of course its great for that, but i love to try and get as close as i can and capture the bird with all that fine detail.
The D800's Af is as good as the D4, and so is the high iso to all intents and purposes. Im not sure on the absolute timings of the shutter lag etc but the D800 feels as fast as my D3 so ive no issues. Sure you might miss a few wing positions, but 6 fps is still plenty in crop mode for most types of birds except for a few with really fast wing beats. If you hone your timing skills it becomes second nature to get the shot you want and you certainly feel more satisfied at the end of the day knowing you have captured to shot you want rather than relying on the D4's frame rate and then picking your favourite from a burst of 30.
Sports Shooters, i would choose the D4 everytime, its what its made for and editors like alot of frames to choose from.