I'm looking for a cheap backup for my G3. How does the G1 compare to the later 12mp bodies I've been considering? Like the PL2, PM1, and GF3 in regards to dynamic range and high ISO. I shoot RAW so jpeg color/AWB is really not too important. One thing I noticed is that there is no rear thumb dial. I really like the magnify feature on the G3. How does the G1 accomplish this if at all? Any other considerations would be greatly appreciated. Thanks.