The K f3.5 135mm ain't all bad, either, and will no doubt come cheaper than even the M version (it's a cheaper lens to begin with - four elements instead of five.)
Four elements, four groups, but does well. Incidentally, the A version's formula has more in common with the K than the M.
Only downside of the K is the six-bladed aperture:
Somewhat chunky bokeh. I don't find it annoying, others might.