My experience with 100mm and 135mm lenses are that they are one of those things that fall into a sweet spot in optical design such that most of them are good, fast and sharp.
The Takumar 135/2.5 k-mount is often considered the worst of the Pentax 135mm.
Usable of course, but the others are much better.
K135/2.5 (similar to ver2 of the S.Takumar 135/2.5 M42 )
S.Takumar 135/2.5 v1 M42
The old lenses are MF, well built in metal and nicely damped for MF.
Beautiful rendering, colors and sharp.
The new DFA 100 macro WR has no aperture ring, and the nice thing is that it has rounded aperture blades for rounded OOF highlights.
Sharp of course.
I'd suggest getting the DFA100 macro WR, since its more convenient and no slouch against the 135mm lenses.