Great camera and very portable. All the lenses are very sharp. I have the 43, 65, 80, 150, and 210 as well as the macro set-up. The 210 is somewhat underappreciated. Don't have the 50, but it's supposedly very good as well.
On film, contrast and sharpness are so high that it does have limitations, especially for portraits, but also for high contrast scenes. The built-in meter works for some scenes and not for others - you may have to carry an external meter.
My personal favorite is definitely the 43mm as there isn't a reflex lens of similar quality in that focal length range.
I still hope that one day they will be able to design a digital version that is able to handle the short projection distance onto the focal plane, just to still be able to use those lenses.