I actually have the GH1 and just got done using it on a wedding that I filmed last weekend. Luckily, I had my Sony Z7U to pair along side it or I would have had a very unhappy bride. I just found a few settings that I am hoping will fix the problem, but I am getting light lines in my picture in low light. In good light, the video quality is great, but in low light its not so hot. Of course I am using the stock lens. For photography, I am not terribly impressed with the pictures. Again in low light situations, its hard to get a clear picture. Feels like a point and shoot almost.
Here is the wedding short I edited together. It was rainy, and the couple were requesting very low light situations for the reception, so its somewhat grainy during parts because I had to boost the gain some just so you can see it with the Sony.
Look at the shot at 4::27 of this video and you can clearly, even in HD, see the lines I am speaking of on her back.
http://www.vimeo.com/6989108
Here is a low light / slow motion test I just did in my kitchen and again you can clearly see the lines. Has anyone else seen this? I am mainly wondering if its the kit lens, if the camera just doesn't perform, or if I have a defected unit.