You may be right about the resolution Jorge! The GRD2 is definitely sharper at corners. The problem is that the small 28mm vs. 28.5mm difference means a lot in the resolution comparison. I will try to set the GX100 to as close as possible (without step zoom) to GRD 28mm and with camera on tripod. But it will have to wait till weekend
I'm now really confused about the higher GX100 dynamic range, because I would expect they both use the same CCD? Maybe not then? Or maybe it's caused by a different lens construction? There seems to be slightly different color reproduction between these two cameras (visible in RAW). Let's assume there is not any kind of malicious RAW postprocessing done over the DNG files. So maybe the different lens construction also takes a role in highlight clipping? I will definitely do some more tests.