Got the G15 for my dad as he had interest (As well as me) in how the lens was much faster. I find the ISO noise to have a somewhat more grainy feel which I like, and I feel comfortable shooting ISO 2000, and combined with being able to go F1.8 has gotten some good shots for dark street candids. I was shooting from day 1 of release with no raw support so was JPG only and I don't like the JPGs even with NR turned off, but overall focusing, controls and possible DOF control are great for what the camera is. That little viewfinder is quite hopeless, but at least it has one, and when there's bright light it helped. I do miss that there's no tilt screen though, would have aided in some more accurate hip shooting.