« on: April 06, 2014, 02:42:41 PM »
Could you post a link to the lenstip.com comparison where you are getting your information? Sight unseen, I would bet the house the Sigma 35 is nowhere close to the Otus 55 in the corners @ f1.4
The Sigma 35 Art:
I would put the Sigma at ~39 lpmm center, 31 lpmm APS-C edge, and 28.5 lpmm FF edge. The Otus at ~38 lpmm center, 33 lpmm APS-C edge, and ~28 lpmm FF edge.
Both, very remarkable for f/1.4.