Member caimi posted several very nice pictures from a horseback riding event, all shot with the Olympus OM-D and Panasonic 45-200mm f4-5.6 lens.
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I bought the Lumix 45-200 with my first Micro 4/3 camera, the DMC-G1. It is an awesome lens - very compact, fast, and sharp. I sold it when I moved to the 14-140mm f4-5.8 and the 100-300mm f4-5.6. I believe the 45-200 is sharper than the 14-140. The 100-300 is so good, I can't say either one is better in the range where they overlap.