EXCERPT page containing first few paragraphs. 2020-09-19 10:40:25
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Sigma supplies MTF only for f/1.4 and only at 10 and 30 line pairs per millimeter, which is nutty as of 2018 where digital cameras like the Nikon D850 hit 116 lp/mm. Zeiss used 10/20/40 lp/mm, which is better, but still low compared to camera requirements. Setting that aside, the MTF looks fabulous.
MTF at f/1.4 at 30 lp/mm beats the 20 lp/mm values of the famed Leica 50mm f/1.4 Summilux-M ASPH at f/5.6. Which means a radically higher performane in favor of the Sigma.
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