I always ponder the idea of a 50mm f/1.2 every few months, and always decide against it. The 50mm f/1.4 is an exceptionally good lens, offers excellent performance (especially stopped down), without the additional weight and hair thin DOF which makes f/1.2 difficult. Sometimes it feels a bit like chasing the large aperture for the sake of it (like the Canon 50mm f/0.95, which is highly sought after but essentially useless wide open). The f/1.2 is probably ever so slightly sharper at the f/1.4-f/2 range, but for the average hobbyist scanning on an Epson flatbed, I'm not convinced by the benefits.