I miss features of my G9 (traded for my G11). One is build quality--plasticy as said above. My need is image quality. Saying that, I shoot jpeg and want good quality images out of the camera. Perhaps I should have bought a G10.
When I buy I seem to compare the G's to a Pany LX3 (soon to be replaced.) The Pany makes the short list for me, but the lens is a little short for my needs. I "think" that has changed with the LX5 that is coming.
Will you consider shooting RAW with the new camera?
I really like the articulating screen on the '11. That's why I bought it. I don't like the feel, and I particularly don't like the buttons just right of the screen's edge, high on the camera. I hit those regularly, and then need to restore the camera. My first G11 failed; internal battery wouldn't charge--the one that holds date and time; without it the camera prompts for date/time to be reset. That's a pain in the tnder spot. Second one is fine so far; took so long to get this fixed I bought a Pany ZS3 as my every-day-carry camera. 25-300 lens is so enticing! No manual control with the ZS3 and no raw....
S90? Not an owner. For me? small, slippery (fixed by franiec grip I suppose); has it's own ergonomic treat--the dial on the back slips and changes settings. The jpegs I understand are digitally corrected to magically resolve distortion. Wonderful feature! f/2.0 lens at some focal lengths.