I would get this lens to just have the ability to move within the 200-400 range without having to change lenses or switch between camera bodies. It's just something less to carry (or more) around at the football games. Just a thought but I'm probably going to stick with the 400mm 2.8 II since I've been saving up towards that goal. I'll try to rent the 200-400 when it becomes available before I make my purchase just to be sure. Or I'll see if I can borrow one from CPS for a test drive.