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Congrats on a fine lens. Do you mind clarifying in which way you think it's better than FD85? Is it the bokeh, sharpness, less CA or what? You sure it's not just that "new lens"-greatness feeling that makes it "better"?
It has noticeably more contrast wide open and is a bit sharper as well which makes it much easier to focus for one thing. With the Pentax, focus "snaps" in and out. This was also an issue with the Samyang/ Rokinon 85 1.4. Poor wide open contrast making it somewhat difficult to focus.
The other quality which I find this Pentax A* really exceptional at is in color rendering. Part of it is obviously subjective but this lens has almost a Leica like rendering with color - not flat like Canon. All that said, I don't have both lenses to do side by side comparisons as I no longer own the Canon.
I do want to stress though, this is certainly not a "perfect" lens (as if one existed!). As I mentioned earlier, there is purple fringing, CA and other aberrations (mostly correctable as far as I have seen thus far) in higher contrast lighting situations until stopped down a bit - maybe 2.8 or so. But...I just love this rendering, even on boring test shots. Here is an out of camera jpeg shot wide open at 1.4 (I shoot jpeg+raw quite often) only re-sized and converted to sRGB for web. No color, contrast or WB enhancement beyond camera jpeg settings.