This is a stellar lens, better than the Canon 24L f1.4 I had before and several times better than the Nikon 20 f1.8 without 2/ Counting 3 at all Stops the Sigma Advantage. Also very sharp at the edges, with little vignetting and very good distortion limitation. Cameralove.org has a good comparison report on this lens with lots of sample photos, very educational. I can't be happier with my purchase.
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