5 out of 10 points and not recommendedprice, sizeimage quality
Perhaps I had a bad exemplar of this lens, but its image quality on my 20D sucked. At f/2.8 it was quite unsharp even at the centre. At f/4 image quality improved dramatically, but was still below my 17-40/4@28/4. At f/8 the two were just about equal.reviewed November 5th, 2006
I only heard good word about this lens, and the test here at SLR-gear is quite positive. But as I was looking for a high-speed "normal" prime for my 20D, this lens certainly failed to impress me. I should probably test another exemplar at some point.