For low light work the GX200 is really not good unless you can get away with using a low ISO and can rely on steady hands and the image stabilizer.
Took a few pictures while having some drinks in a pub this evening and this I liked best. I did have to underexpose the picture to get a good result out of the GX200, unlike the GRD I where you have to slightly overexpose. Also you need to desaturate the blue channel quite a lot so as not to get blotchy noise after using Noise Ninja or other noise reduction methods.
I do hope the next GX camera will have at least a faster lens and better high ISO to make these shots easier.