I did it by choice and the sigma is well, a sigma (nothing wrong with it at all, just that it's newer and has no nicknames as far as I know).
The Sigma 50 f/1.4 is pretty much universally called the Sigmalux. Mainly because the image quality is such that it is being compared to Leica (summilux). Not that the Sigmalux renders similarly to the summilux, just that, especially for the price, it's a top class optic.
50mm f/1.0 L

