Reports Predict a New Sigma 50mm f1.2 Art. Is Flare Too Much to Ask for?

Sigma is rumored to be developing two new 50mm lenses for the Sony E Mount, a 50mm f1.2 DG DN Art and a 50mm f2 DG DN Contemporary. But, the new lenses, if the rumors are in fact true, beg the question, how many 50mm lenses does one system need? With several 50mm E-mount lenses already available -- eight in our Sony E Mount lens guide alone -- Sigma is going to need to set itself apart with more than just price.