This lens looks kind of cool mounted on the E-PM1 It is a preset lens, i.e. you can set the aperture with one ring, and then open/close the aperture from fully open to the preset value with another ring. I do not master this lens yet. It is very difficult to avoid motion blur. I think the lens is sharp, though, altough I am not sure. There could be some haze in it? Due to the shakiness it is very difficult to focus correctly, perhaps that is the reason for the not-so-sharp images? The lens has an increadible bokeh, due to its 15(!)-blade aperture.