OM 50mm f1.4. A beautifully made lens with a fine precision movement feel to the focusing ring that has just enough resistance that makes it a joy to focus. None of your Russian tank grease here, these Olympus lenses have a lovely white, low viscosity grease on the helix. On the Olympus lens I opened it was as fresh as the day it left the factory, usually you can expect to be scraping crud out of the threads on most lenses. The F stop ring is at the front which takes some getting used to, on a lens this small usually it is a rear aperture ring.
Wide open centre performance is above average, of the 5 50mm 1.4 lenses I have I would rate this as 3rd best after the Zeiss Planar and the Yashica ML for sharpness, but slightly better than the Super Takumar (non smc). Stopped down this has good sharpness but not outstanding like the zeiss. A nice lens for general use especially if you are expecting to have some evening shots without a tripod, you may just sneak some shots on a high ISO. I have also used this for shooting bands playing in a club with minimal lighting. It is a good solid general purpose lens.