Had a play with this lens at Photo East yesterday.
seems very impressive.
- very large
- but lighter than that size suggests
- a little disappointed the lens isn't faster than f5.6.
- manual aperture, but with an quick stop down ring (the blue one)
the 120mm is a very simple construction, with just 6 elements, and they claim maximum res is at f/5.6. lots of knobs to turn, a little complicated for outdoor use, but will be fine for controlled use in studio or architecture.
will probably get one.