Fast, excellent lens!
Crutchfield Customer Review (What's this?)
I was using the Panasonic LUMIX 40mm f1.7 before trading up to the Olympus 17mm f1.8 after seeing a video on the focusing speed of both. Both lenses were aimed at near/far objects. The Olympus 17mm was more than twice as fast compared to the 40mm. My experience with the LUMIX 40mm in low light was that it hunted and was painfully slow. Under the same conditions I found that the 17mm Olympus was much quicker, almost instant. The professional reviews of the lens also proved that it was very good with sharpness, contrast, and color. Plenty of actual photos on the net to judge for yourself. BTW: I was using a Olympus Pen F. If you're using with non-Olympus cameras I can't vouch for the auto focusing speed.
Pros: Small, lightweight, all metal DOF scale for manual focus Sharp, beautiful Olympus JPEGs
Cons: No lens hood.