Thanks folks for the nice comments.
I am delighted with the GX1 and finding it a very worthy upgrade from the GF1 (that I loved to use), I am finding the high ISO on this camera as well as the Auto ISO really great and the AF is considerably faster than on the GF1.
I am still using SFX for my B&W conversions and the results are very pleasing to my eyes.
For those considering the upgrade I can recommend it.