First day out with the GX200 and I am very impressed. It is in almost every respect better than the GRD II as long as you don't go over ISO 800.
The lens needs to be faster though, especially as you zoom in you lose too much. The JPG quality is very good though even if it does not get close to the GRD I JPGs. Even long exposure pictures can be used from the JPGs, something that is impossible with the GRD II. So far my impresions of it are very good and I would say from the current Ricoh cameras it is the best right after the GRD I. The RAW files are as good as the GRD II but with less contrast and not quite as sharp but this can be easily fixed. The only most notable differences are the distortion and the size of the camera. I was even quite impressed with the EVF. More will be posted in my review. For now have a look at some pictures