Here’s a quick little vlog testing the differences between the GH1 and GH2 (exact same settings) at ISO 1600 and 3200 respectively.
The GH2 has come quite a ways forward from the GH1 in terms of processing high ISO video.
Cameras & tutorials
GH1 vs GH2 low light anamorphic comparison
Edited from the Eyepatch archive. Technical observations and credits reflect the original material; old availability and prices are historical.