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- Tommy
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GM does retain slightly more contrast in backlit situations but sigma is pretty close and can be easily fixed in PP.
As for the link I don't really trust him fully, but according to that table sigma is "outstanding" while 85GM is two steps behind at only "very good" (I think GM is better than just "very good"). even samyang is better at "excellent" rating according to him.
I have shot a few weddings with the Sigma, borrowed it from a videographer friend while my missus used the G.M. I was interested in it just for the lighter weight. For me I preferred the G.M so we now have 2 of the G.M’s.