In terms of sheer optical performance the Panasonic Lumix G Vario 14-45mm f/3.5-5.6 ASPH OIS is not a great lens. However, when looking at the auto-corrected results, and this is where it counts from a user perspective, it's capable of producing quite good results. The center resolution is generally on a excellent level straight from the max. aperture setting. The border quality is still relatively decent between 14mm and 25mm although it's nothing to rave about. At 45mm we've an evenly high quality across the frame. The vignetting is still comparatively pronounced at 14mm @ f/3.5 despite the auto-correction. However, it's not really an issue anymore at other settings. The build quality of the lens is very decent especially for a kit lens. The AF works basically silent, it's surprisingly fast and highly accurate (also thanks to the G1's contrast AF). The "Mega OIS" (image stabilizer) can give you an extra potential equivalent to 2-3 f-stops in field conditions.