So a simple way of getting higher resolution images from the GF1. With practice you can even include moving elements in the shots. 12MP needn't be the constraint on quality and resolution it seems to be. Yes it takes a little more work but not as much as you might think. Stitching 2 images together doesn't take Photoshop very long, particularly as you can do this with the raw files without even converting them. Just click on the ones you want to use in bridge, select photomerge and photoshop produces the stitched image. There's usually some cropping involved, but this doesn't take very long at all.
Finally a word about the 45mm f/2.8 macro. This really is a superb lens. Very sharp and crisp, even wide open. Used in a non-macro situation the AF is also very quick and precise. Slow AF is a criticism often levelled at this lens, but in the situations I use it, I have no problems at all.