BTW, that image is pretty clean for ISO 1600 on the G10. Did you do anything special in post-processing?...
Yes: noise reduction is kept at only 10 (in LR3), to preserve detail… however, given that shadows are totally unimportant in this type of shot, blacks are ramped up to 50… that kills shadow noise almost completely… and lastly, the window did not have to be sharp at all, so I used a gradient filter with sharpness set to −100 (thus acting as a lens blur, blurring the noise as well)…