I've never seen a G-6, but I own a G-7. The lens stabilization is good, and helps me get photos under low light conditions that would otherwise require higher ISOs or a tripod. The optical viewfinder ranges from "not terrible" at 35mm to "not usable" at any longer focal lengths (serious parallax error). The external ISO dial is a nice touch. For me, it's usable at ISO 400, though noisy, and ISO 800 -- well, it makes pictures. Very noisy, but sometimes I'd rather have a noisy picture than none at all. The smaller size is a major plus for me, as I want something that I'll actually carry when not at work. As for operating speed, it's not close to a DSLR, but it's not bad for a compact. Pre-focusing speeds things up. Overall, it's hardly a perfect compact camera, but it's close enough for me right now.