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My edge performance wide open has been fantastic... Really impressive. Just check out all my shots above, all shot wide open.
This lens clearly exceeds at resolution across the frame compared to the 35L, no contest. I have owned the 35L twice now, so I do have experience with it. Love that lens... I do love the Sigma 35, more though.
I did send my original Sig 35 back for an exchange though, due to some strange AF behavior... Depending on lighting, distance, etc... I got varying results. Outdoors, leaving the MA at 0 was best and got amazing results. In artificial light, I required +9 for sharp results. It also varied with distance, so that might be the result of my findings as well (versus light). So I am trying another. If this next one works perfectly at all distances and lighting, it will be by far my favorite lens. The performance is simply amazing and AF is quick and reliable (other than the adaptive MA values above). No crazy misses or anything of the sort, works as good as any L lens as far as accuracy for me on my 5D3.