Does the Canon 50 1.4 still hold up well compared to other 50 offerings from Sigma, Zeiss, and so on? I'd love to get the Zeiss, but the manual focus and harsh bokeh make me think twice. The Sigma seems to have focus issues too. Yet the 50 1.4 is getting long in the tooth with its old USM and Im wondering if the other lenses have better the quality of pictures or not. What say you? Other option is the 50 1.2L, but thats a whole other league then these.