well, i have several times, it is generally okay except for a couple of quirks:
* sync speed is 1/50 which is okay except when you want to use a
90mm for portrait, then you might have to wing it and be careful or use a tripod.
However, i found it a non-issue to use 35mm or even 50mm for
studio work. this makes it a bit special compared to the many dslr
users who tend to use 85mm for portrait. Going at 50mm means
having to be quite close to the sitter. a very different experience.
check out jeanloup sieff, he used the 28mm in many of
the studio/daylight photos.
raytoei
here's one from m4p with summilux taken last year. film is plus-x (i think)
you can view more from here:
http://www.modelmayhem.com/raytoei <- click on the profile pix