"The Olympus M.Zuiko Digital 14-42mm f/3.5-5.6 ED is relatively good match for the E-P1 but don't expect a stellar lens. The delivered resolution is pretty decent across the range although it lacks greatness towards the borders and at the long end of the zoom range. A strength of the lens is the lack of vignetting. The M.Zuiko suffers from a moderate degree of lateral CAs which doesn't seem to be corrected for whatever reason. ... A bit more problematic is the build quality of the lens - the inner lens tube is very shaky ... All-in-all a lens which has been primarily optimized for compactness and a low price tag."
Read the full review here.