I've personally used the 80-400, it's very sharp all the way through. If you can tolerate the lack of VR as compared to the nikon equivalent, then you're set. The only annoyance I had with the lens was in the focusing ring. It's an exterior ring, right where your hand is, so you feel it turning as you hold the lens. *shrug* Was only a minor annoyance. Great lens, worth every penny.