We have a 35ART that performs very well, but while our 20/1.4 was optically great, it's AF was a #$%^ hot mess and was returned. At that juncture, we stopped looking at Sigma for any glass adds. The optics are great, but 1 : 2 on AF consistency (vs simple MFA) is not a great hit rate and inconsistency between copies and/or bodies is not something we want to deal with. If they re-housed the optics into a premium Zeiss-like manual focus line, we'd come looking again.