I use the Voigtlander 40mm finder with my Fuji GW690 and 90mm lens. I bought it for my 40mm rangefinder lenses, but it's a very close match in coverage for the 690, and the view is higher magnification (about 85-90% lifesize with the Voigtlander), and much brighter and clearer than the Fuji finder. I've briefly handled a G2, but can't make a valid viewfinder comparison for you.

Lee