My old Olympus Zuiko Digital ED 12-60mm f2.8-4.0 SWD, which I still have and use occasionally on my Olympus OM-D E-M1 through an MMF-3 adaptor.12-60 on a 4/3 lens is about the same as 24-120 on a full frame, which is really nice for a general carry-about lens. It is a very sharp lens and the definition is really amazing. If it hadn't been for that lens, I would have dropped Olympus a long time ago. Even so, I now muddle between Canon and Olympus. The Canon is great for challenging light conditions. The Olympus for everything else.