The 80mm's with the T* coating should perform better, it's the stuff that gets applied to the modern lenses. Side by side comparisons might not yield immediately obvious results, but against flare, the difference is more apparent. Plenty of folks out there happy with their chrome version though. I've got a CF, and am highly satisfied with it. Slightly long MFD though, you'll want to invest in a short extension tube for head shots.

Also of note, the aperture blades are supposedly bent on purpose to reduce impact. Something that caused me a bit of worry when I first got mine.