The fastest 50mm standard lens I own is a Canon FD 50 f1.4 and I have no desire for a 50mm lens that's any faster, however I do have a Canon FD 85mm f 1.2L portrait lens because portraits are my main interest that I bought new in the 1980's that I rarely use at full aperture because I.M.O. no lens gives it's best performance wide open it's against the laws of physics.