I only have Nikon lenses and they are rather big so I haven't bothered. I'm with Luke on this one. The Fuji lenses are really great (as good or better than my Nikon ones). Soon enough, probably by end of 2013 at the latest, you will have the following FF equivalents, 14mm, 28mm, 35mm, 40mm, 50mm, 85mm, and 90mm. I would expect the new lenses will be as good or better than the ones already released. Fuji has been making high quality lenses for quite some time both for film cameras and for cinema/broadcast TV. I would be hard pressed to say I have used a better lens than the Fuji 35mm (50mm equivalent).