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Message: <blockquote data-quote="eastwood" data-source="post: 1426776" data-attributes="member: 45877">May not be a fair comarison, but here it is. I started out to find the White-breasted Nuthatch, a lifer for me. I mounted the Sigma on my 50D and the Canon 300 f4 + 1.4 on my 40D. When the bird was seen by someone, it was high and far out on the branch of a conifer. I shot with both gear in order to get a record shot. Both at 1/125 secf9, -2/3 ISO 640 0n 40D and 800 0n 50D. (1) and (2) with Sigma and (3) and (4) canon prime. I selected one of the best from about 30 shots from each. (1), (3) reduced to 900X600. (2), (4) cropped 100%, though not of same size. No process. (I posted one a moment ago, but found that there are 2 more better ones from Sigma for comparison because they were almost taken at the same spot). So it is very true that taken at a close distance, the Sigma is a great lens to use, but at a distant, the IQ falls short somewhat. An all-rounder or a sharper lens? No right or wrong answer -your call!</blockquote>