Thanks for all the input.
As best as I can tell from CZ's website, the 85B appears to have fixed sights, while the 85 Combat has an adjustable rear sight.
As best as I can tell from Marstar's website, the Norinco NZ85 copies the CZ85B, having fixed sights.
(This is all moot for me until my dentist tells me how much that popcorn I had last week is going to end up costing me, but while I am sure my long sought Browning Hi-Power is out of reach again, I am comforting myself with the hope that an NZ75 or 85 might be possible in the interim, and if that happens and if I like it I may eventually wish to replace my Ruger Mk1 with a CZ Kadet conversion for the Norinco.)