Michael Axel , Jan 08, 2007; 07:56 p.m.
Having used both cameras (well the 67 version of the Fuji), the Xpan images I've seen are incredibly sharp. I was blown away. I did not shoot, nor have I see color images with the Xpan. The Fuji is very colorful but I don't think it's nearly the sharpness of the Xpan's 45mm.
As for converters, I've been looking for a Leica R to Canon FD, so I've seen a lot of converters on eBay. I've never seen one for Xpan--probably because they're so rare. You could ask these guys about adapters, and whether they have access to them: http://www.fotodiox.com.