I bought mine from Amazon.com last August and have had zero problems with it. If I have FF, I am not aware of it. Would I buy it again? You bet. I have the 15mm Limited, the 18-135mm, the 16-45mm, and the 35 mm f2.4 as well as the 18-55mm and 50-200mm kit lens. However, I do not own a lens with a wider aperture than f/2.4. These are two indoor photos without flash. I want to stress they are candids, learning the lenses, and are far from perfect and not necessarily the camera's fault.
Tungsten lighting - sick husband - 16-45mm f/4 1/25s at 45mm iso 3200
CFL lighting 15mm prime f/4 1/10s at iso 3200