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The Canon FD 135mm f2 is likely very similar to the EF lens in performance. It was quite a bit less expensive than the EF lens last time I looked, though if I had a Canon the autofocus and auto aperture would make me prefer the EF lens. I had the 135mm f2 EF lens for awhile - great lens, but I found it extremely difficult to nail focus with any practical subject at f2 given the 5D autofocus system. Now with my Panasonic GH2 it would be something else altogether - very easy to nail focus is especially with the face recognition autofocus.