I just picked up a mint Canon 7 with a spotless, no fog 50mm f1.1 lens. I'd like to get an older 50mm f3.5 to use on it to keep the 50mm f1.1 from getting used and abused. I'm just curious as to how the 50mm f3.5 Canon lenses compare to the legendary 50mm f3.5 Elmar.
