I finally pulled the trigger on a GH2, couldnt resist the B&H deal for $699 with lens.. So far im liking it, I would say its a decent upgrade from the GH1, depending what your using it for. I do a mix of pics & vid, LOTS of HDR..
The Auto-bracket is SO much better since the latest firmware upgrade compared to the GH1. I do Virtual home tours with every indoor shot requiring HDR. GH2, 5 shots, or 7 shots, no waiting, super fast (with 95 mb/s card). Consecutive 7 shot HDR still bogs the camera when I do HDR panoramas, but still 4x faster than GH1!
Im not liking the wheel on the thumb, but hopefully ill get used to it.
SD card a little more clumsy, but no biggie.
Figured out that the tripod mount moved slightly, had to modify my custom pano setup a hair.
Much better autofocus, speed and accuracy. Less hunting. I was able to focus on a power line with my 100-300 lens, GH1 would hunt..
I think the Image quality is on par with the GH1, not noticeably different. The feel of the camera is a bit more... Plasticy
Highly recommended camera, hope it lasts as long as my GH1.