Samuli,
I spent a week with one on my 1Ds2 and never saw any of the bokeh CA you're referring to. Lens was very sharp starting WO, very well CA-corrected, good bokeh, realistic color, nice clarity, solid construction, same fast-pitch focus as 80-200. Essentially think of a wider 80-200 from what I've seen. Oh, front element does rotate.
When I think of that lens as Leica's starter 'kit' glass vs the typical EoS L zoom or Nikon/Canon 'kit' glass I can't help but laugh.
I hear you on sales. With SHPhoto out of Germany (among others) offering new R stock at 1/2 list... Decent used price would be $500ish