ISO Wars: Panasonic GH1 vs Nikon D90 vs ...Canon SX1is

Camera Labs seems to enjoy hosting ISO Wars. Their latest installment, which got buried in the E-P1 pre-announcement mania, features the Panasonic GH1 (w/14-140mm) going up against the Nikon D90 (w/18-105mm) and the fixed-lense Canon SX1is. Their test starts with the analysis-discussion and includes the comparative crops at the bottom. Full-size samples are not provided.

So how does it do? Is the sensor-size a factor in the results just like it was for the E620? Does it matter? How do these results fit in the grand scheme of things? We blog, they test, you decide!