The D4 sensor is about the only thing that makes me want to buy one, its either this or a 7100. I need something for runway and i shoot about 15 thousand images in about 3 days. My issue is I am wearing my D800E out and I do not need 36mpx to shoot this stuff. I do need fast continuous focus and about 3 fps only. I shoot about 5 frames in a 75 foot walk down the runway any more than that its way to much to load up via smugmug. I need a vertical grip too or else its no good for me. I just checked a rental for a 7100 and its only 185 bucks for the time I need it. Frankly that is my best option but I like owning stuff. LOL
This is the ONLY gig I shoot jpegs on, so they have to be good out of cam.