As I said earlier the AF of my D800 is not near good and I do not shoot moving objects as you are. I am shooting mostly portraits, but even with stationary object the AF is just hit/miss. From 5 shots usually one is in good - very good focus and I have AF fine tuned my lenses. As I said, I am prepared to go with 5D3, the problem that I will miss some great lenses. Never mind, the images will be a bit more blurry, but at least in focus. Even under that conditions will the image be sharper as with D800 randomly back/front focused photo.