My question is clear, sigma has a cheaper 50mm 1.4, that is newer, and made for digital camera, with all it's coatings, and apparently it has a special digital focusing system. But, then there is the 1.2 l, it has about half a stop of luminosity more, which I don't know what difference that makes, and it's an "l" lens.

Please keep in mind that I'm asking which is better in total and in different ways.

This is to fill a gap in my range, (16-35 and 70-200 2.8 is ii), so I'm looking for one that won't fail me