The Olympus lens is very small and while the Panasonic 20mm f/1.7 gets all the attention and is a better lens in terms of sharpness I like the 17mm. Its slightly wider and a decent lens in its own right.
The Olympus E-P1 does deliver "punchier" results than the Panasonic G-series cameras - which means a little less post-processing on my part.
I would be interested in an E-P2 with the viewfinder, but only in the silver version. I love the "retro" look of the E-P1 and hope the "non-black" version does appear in this country.