So I am almost ready to buy this lens. I found one for at a good price and its a USA version and will have the full warranty otherwise I wouldnt buy it. Anyways, just wondering what the current owners feel of the combination. I am very happy with the 70-200 F2.8 so that is why I started looking into this one now. Mostly for hiking like on our local Antelope Island to capture wildlife. And maybe the Zoo (not sure how good it will be at "eliminating" the cages compared to a faster lens. Thanks!