The GX1 pairs nicely with the X 45/175mm lens
I reviewed the 45-175mm X Lens on the GX1 as part of my GX1 Review at https://londonstreetphoto.wordpress.com/2011/11/13/gx1-review/
The lens is small, light and well balanced. The manual zoom-by-wire ring works just as well as the power zoom so you can happily use either.
