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New 30mm F1.4 DC HSM by Sigma has a very different optical design with front element much smaller.

Looks like a simplified version of their latest FF 35 F1.4:



http://www.sigma-global.com/en/lenses/cas/product/art/a_30_14/features.html



Old 30/1.4:





New 30/1.4:





FF 35/1.4:





MTF time!



Old 30/1.4:





New 30/1.4:





FF 35/1.4: