*cough* Yeah, I am a bit surprised. Although, it was very sharp for me when using the center focus point. However, whenever I used an outside focus point, the results were horrendous (it would frontfocus by several inches). And it was the same with 2 different copies I had. Of course, I was using a 50D...and the 11-16 was developed during the era of the 40D. So it might be a simple incompatibility with the newer 50D (although I think the 50D's autofocus mechanism and algorithm are identical to the 40D).