dennis
Just received this lens this morning. Shooting hand-held instead of a tripod, mirror lockup and remote shutter release this lens is much better than the Sigma 70-200mm I got last week. I did use a tripod, mirror lockup and remote shutter release for the Sigma lens. Dont even think I will bother with a tripod for any further testing. Lens is sharp wide open at F/2.8 and at all F-stops edge sharpness is great. I just decide to suck it up and buy this lens. It is unfortunate that Nikon and Canon seem to want to gouge the public on their equipment plus add in a little price fixing as well. Because of this fact alone I will not give the lens a five star rating.