A slideshow of images shot with the Sigma 120-400mm APO DG OS on my Canon 60D. It was snowing out for most of these, and I found the 60D struggled a little with the focus in the snow.
As far as my impressions so far of the Sigma 120-400mm APO DG OS, it's VERY good! Quite sharp through-out the range, but sharpest from 120 to 300mm. Focus is fast, and I'm really enjoying this lens!