I see people praising the Sigma 35. You can surely go for that. I have a copy of that lens & I love the images it produces when focused spot on. I have not taken any photos with it that would suck because of "bad bokeh". Nailing the focus is a much greater issue.
Getting the AF to work may be problematic. Basic AFMA tests gave me a horrific value that only made things worse. I tested the lens on real subjects and ended up with a value that seems to work nicely. I'd say that you cannot really trust the focusing even when you have the correct AFMA in place. In servo mode the lens tends to be really slow and on a 5D3 you end up with plenty of OOF photos. There is no scientific research behind my statement, but I'd claim that especially with servo you can trust the 35L's AF much more. This might in the end be more important than the additional sharpness of the Sigma 35.
Getting the AF to work may be problematic. Basic AFMA tests gave me a horrific value that only made things worse. I tested the lens on real subjects and ended up with a value that seems to work nicely. I'd say that you cannot really trust the focusing even when you have the correct AFMA in place. In servo mode the lens tends to be really slow and on a 5D3 you end up with plenty of OOF photos. There is no scientific research behind my statement, but I'd claim that especially with servo you can trust the 35L's AF much more. This might in the end be more important than the additional sharpness of the Sigma 35.
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