Re: Sigma 120-400 4.5-5.6 OS
Personally, I've been much more interested in the Sigma 120-300mm f/2.8. But I've heard good things about both lenses. Did you check the zoom lens reviews to see if we have user reviews for it?
Re: Sigma 120-400 4.5-5.6 OS
Yep, first thing I did. The version I believe this replaced, the 135-400mm, is reviewed, but not this one.