I received my 14mm from Mathers last week, I've been waiting for this lens for a while as it's perfectly suited to the GF1. I don't use the zoom lenses with the GF1 (I currently have the 14-140mm and 7-14mm) as the GF1 body's lack of grip makes them handle poorly so the GF1 has been left with the 20mm lens. While this is a great little lens it's obviously no good for any wide angle which puts me off using the GF1 on its own, instead it's usually paired with the GH1 as they can share batteries/SD cards and I can quickly switch to the 20mm.
However with the 14mm lens it means I can take the GF1 and one lens in a pocket with the other pancake lens slipped in another which keeps the setup compact and gives a lot more versatility. The 14-45mm is of no interest because the added size throws away the compact GF1 package at which point I may as well go up to the GH1.
John