-I have in the past both of them, the 45mm is the sharpest lens in 35mm and maybe in all format from all the lens i have, leitz, zeis, nikon and what ever. I remember when i focus the negative in the carrier the sharpness in hair is finish in a single grain of emulsion!! first time i so something like this..
-I like also more the g1 because is small and with the 45mm you can have always with you, i have the g2 but is bulkier and any way the only downside for me its the small finder, the exposure and focus work perfect.
GET THE 45mm EVEN IF YOU DON'T USE MUCH YOU HAVE THE BEST LENS EVER MADE THE PLANET EARTH!! PERIOD--