As you have G10 and G11, could you show us same things shooted by each one to really make a good comparison.
Please shoot in manual mode to be sure to keep the same settings !
Process them with the same program and settings.
Show us only 100% magnification.
Small parts of the image but with decent jpeg quality setting !
Wanna see especially dark areas details, blue sky with gray clouds at 200, 400, and 800 ISO.
Have a Nice Day !
Thierry