This pic has been taken with the E-P1 + adapter and OM 135mm f3.5 lens. The camera was tripod mounted. Noise reduction and noise filter were both turned off, which might explain the slightly "gritty" look of the picture.

An expert from Olympus warned me that the OM lenses do not have the resolution of the digital-specific lenses and I think he is right. I suppose that there has to be some merit in the fact that the 4/3 system is just that -- a system comprising sensor and lens.