So I got a very good price (about 50% under the general 'going rate') on a near mint Canon FD 135mm f/2.  The lens has flawless glass, flawless aperture blades, perfect focus and only a few very small, very minor scuffs on the retractable hood.  It looks practically brand new.  I also got it complete with original box, all original packing materials, caps, manual, unused warranty card and even the original silica gel!    My FD->m4/3 adapter came today, but I only had a chance to take a few shots.

First impressions:  This is a very good lens.  It's pretty sharp wide open (not critically sharp, but still very good), with very nice bokeh.  The only downside optically that I can see so far is that like many fast older lenses, it is prone to a bit of purple fringing on high contrast areas and a fair amount of longitudinal CA, depending on the subject.  Overall, though, these are pretty minor, and to get good resolution wide open on the extremely dense GH2 sensor, means that I bet on full frame this thing would be absolutely amazing (if you could hack it apart to adapt it).  Anyway, I'm using it as a fast longish telephoto, and I think it will perform quite well for that. It's built well, but is rather lightweight for the length/aperture.  It handles really well on my GH bodies.  I think I'll like this a lot.

Quick shot of my daughter, wide open:



And some shots of the lens on my GH2 (hood retracted on all of these):

WOW, Nice 1st impression!

How does it  balance? do you find a bit shaky hand held? with my Nikkor 135/2.8, I find a 1/400 minimum to avoid camera blur.

There is a Sample Archive already started for samples...  as long as this thread stays a discussion on the lens, cool...
http://e-p1.net/lens-sample-photo-archive/canon-fd-135mm-f2/

Feel free to add samples at your leisure.

That girl is as cute as a fairy tale...the lens.is cute too..