I've bought the Canon 50 f1.2 used in 2006. Used it professionally on approx 500 weddings, many other photo sessions, used it extensively on a number of international trips.
Love it! But... stupidly, on a trip to Japan, the bag I used had the camera, positioned back down. I would be picking up/putting away the attached 5D M2 by the attached lens hood. I made it through the trip, but the front came off a few weeks later! CPS repaired and it's been good since 2010.