Agree though I think you would have to settle for the VR1 version of the Nikon so probably not anything in it for focus and low light. The Nikon will most likely hold it's value better however. I've seen what the Nikon can do in both VR1 and VR2 versions and it is one of those lenses that can be rightly be called a legend.You probably would be best served with a 70-200 2.8 lens. Nikon would be my first choice, but both Sigma and Tamron have had good reviews. I think the Nikon one might focus faster and better than the others in low light.