The G11/G10 and to a lesser degree, the S90 lens are optical marvels and several lens tests have shown this to be the case in particular regarding the G series lens.
The other James
Yes the photos are amazing for a P&S from this camera. I think I'll keep the G11 for topside photography, and use the S90 mostly for UW and a pocket camera when needed.
I'm sure I'll be happy with either one of these cameras uw, but the wet lens idea really has me wanting to go with the S90 for uw photography.
Thanks to everyone for their input.