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I recently purchased this lens too, for my "new" 5D Mark II. Having literally only played with it for about 10 minutes, I am pretty impressed, and glad I didn't get a "bad" copy (at least, I don't think I did).
See attached pics - 30s @ f/2.8, ISO 1600.
First pic is straight from camera (RAW > JPG) with minimal level adjustment, second is crop of Crux region, third is crop from top right hand corner (same dimensions as the Crux region). Distortions appear to be minimal.
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