I've been playing with a G10 for a couple of days. Thought I'd post a few observations as comparison to my G9.
It is very slightly longer than the G9, and a little taller. The enlarged grip feels pretty comfortable, not a biggie, but I do like how it feels in my hand. The Lens barrel is slightly larger to accommodate then new wider angle lens. At the widest setting on each, the G10 lens doesn't protrude quite as far, but at full telephoto the extension distance is nearly identical.
Battery is new ... very square and appears a little larger. Bummer for those that use multiple batteries. I'm not sure the increased size is enough to offer any significant improvement in battery life.
The mode dial is now slightly smaller but much taller. Since the slope up to hot shoe is more than the G9, despite being taller it still doesn't extend higher than the hot shoe. Actually easier to use. The ISO dial is now a secondary dial around the base of this dial, quite convenient. The real advantage of this is the previous iSO dial is now a manual exposure compensation dial. This dial is recessed into the top a little so it won't get move accidently, but can easily be moved when wanted. This feature is extremely useful when trying to fine tune exposures, for example using ETTR. Simply adjust the exposure compensation dial until the histogram almost clips. I tried this for several exposures ... it worked very well.
Nothing else seems much different when using the camera than the G9. Maybe a couple of slight menu item changes.
Image quality seems very good. I do like the slightly wider angle of view. The camera ships with DPP 3.5 which supports the G10 RAW files. This is a switch from the G9. Interestingly enough, they didn't bother adding G9 support when they built the G10 support into the software. No LR support yet, so my comparisons so far have been G9 files processed in LR vs. G10 files processed in DPP.
Way to soon to draw any major conclusions, but IQ of the G10 is very good, and a slight improvement on the G9. (could be wishful thinking ... excuse to feel like it was worth buying.)
I've attached a quick image, along with a 100% section ... detail and sharpness seems good. Shot at 28mm equivalent, f/5.0, 1/500th, ISO 100, handheld. No sharpening during post processing on either.
Headed to CA for a week, will be playing around with this on the golf course. I may try to do some side by sides to see if noise is improved.
[attachment=8727:G10Sampl...ullFrame.jpg][attachment=8728:G10Sample_1to1.jpg]