idk... other than noisy AF, no-USM, no FTMF, and softness from f/2-2.8... i'm a happy camper with the 35/2. Sigma fills in those gaps with the 30/1.4 at a price and border softness. IDK... its a tossup. Every lens has its quirks. If its not in image quality, its in weight, build, etc etc (17-55IS and 70-300IS comes to mind for the latter)
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