There have been plenty of arguments over which has better quality, the G1 or G2. The G2 probably produces better images for enlarging to that size because of its 4.0mpx CCD, but many argue that the G2's pictures are not as sharp. You can check out my G2 pics on my web site if you'd like (see my sig).
I'm not bashing the G2 in any way, but I understand the "soft" picture argument. It's a good camera, but I think there is a large learning curve with it. I've had it since December and am still a long way off from perfecting my technique with it.