Lenstip has reviewed the Sigma S 500 mm f/5.6 DG DN OS. It is optically great, being virtually diffraction limited. What is additionally interesting is that this very careful and reliable site explains how they coped with the problems from a long focal length. I suspect certain other sites are not as careful in their IMATESTs with supertelephotos, explaining why there is sometimes variation in reported values. It's a pity we don't have such a prime for Canon.
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Sigma S 500 mm f/5.6 DG DN OS review - Introduction - LensTip.com
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