I generally haven't had a good experience with the G3 in general. I had two and returned two due to problems with the sensor. Dozens of dead pixels and stuck pixels in exposures over 1 second. I purchased an M to 4/3 adapter that I would like to sell but tried lenses from 15 to 90mm on it. These issues could be related to sensor issues so I can't say for sure that it was an issue with the lens working on the camera. My 15 Voightlander was sharp in the center but terrible at the edges. I found this to be true with my 21 Elmarit (non asph) and 25 Biogon. Centers were good but edges smeared. The 35 Biogon was Ok but not what I expected as was the 50 Planar. OK but not great. The 75 Summilux and 90 Apo Asph Summicron were some better and improved stopped down.
Overall I was quite disappointed with the performance which I feel might be problematic sensors vs the camera in general. I also had experienced smearing issues at the edges of the frame with the kit lenses but not to the degree that I ad with the M lenses.
I would like to think the problem was isolated to the two cameras but two in a row from two batches of cameras ????. I was looking for a small carry camera for vacation to replace my G10 Canon. Unfortunately the Canon zoom outperformed both the kit lens and my Zeiss and Leica glass.
I use Canon 1DsII and Hasselblad digital equipment in my work so I may be too critical but I did expect a little better performance particularly for the price. I finally purchased a Nikon D3100 with the kit lens for vacations. Even though it's slightly bigger it well outperforms the G3 even with the M glass and for $200 less.