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It sounds to me that with the type of shooting that you do the ZE 50 f/2 MP, would be a better lens for you than the Sigma. I think it is worth a try. By the way, I think the ZE 50 f/1.4 Planar is weak at close distances and especially close up, but is stellar at further distances and especially when stopped down. It is a great lens if you know what to use to for and what not to use it for, and Zeiss has smartly made the two fifties complementary in their strengths. The 50 f/2 has fewer weaknesses, but is not quite as good as the 50 f/1.4 at distances and stopped down, IMO.