I remain skeptical.
Supposedly, the firing pin block on any "b" gun can be smoothed well enough that it does not negatively affect trigger pull.
(I suspect that's at least part of the reason why Mike's trigger jobs -- he's the CZ gunsmith -- are so good and so expensive).
I don't think anyone is likely convert an 85 Combat to SA, so we'll probably never know, but I'd bet that in a fair test, there'd be very little difference in shooting results between a well-tuned 85 Combat (converted to SA) and a well-tuned 75B SA.
(For that matter, I can't imagine even a tuned 75B SA having a much better trigger than my recently acquired pre-B 75 which is DA/SA.)
If that's true, then results are likely to be more dependent on the shooter, the wind (if outdoors), distractions, other quirks of the guns, than the triggers themselves.