It seems to be not about cheap kit zoom lens but about the camera. Oly 14-42 fitted on Panasonic GF1 delivers very fast focus. Speed is about the same as with 20mm lens. So since e-pl1 is more suitable for UW shooting due to simple button controls one could improve focusing speed by switching 14-42 kit lens to Panasonic 14-45 if it fits the port.