Not a big mistake.
(Aside: I've had a CZ-75B, which was "gunsmithed," and currently have a CZ-85 Combat, CZ-40B, and an EAA Witness Sport Long Slide in .45 acp.)
The 85 Combat also has an extended mag release. We're talking an additional fraction of an inch. If you're not shooting competitively, I doubt you'll notice the difference; you may not notice even IF you are shooting competitively.
You can make your mags "drop free" by tweaking the mag brake spring or getting a replacement part. ($7? from CZ.) You'll find instructions here on the site, if you look long enough. (Probably under Home Gunsmithing.)
Adjustable sights are nice, but far from a necessity. And once you find a load your gun really likes, you are unlikely to make further adjustments. (I have three guns with adjustable sights; once I zeroed the guns in, I haven't touched the sights; I just keep shooting the same ammo.)
The most important difference between the 85B and 85 Combat is that the 85 Combat does not have the firing pin block, which means a slightly better trigger, out of the box. But a good local gunsmith can make the already good 85B trigger better, and you'll probably never notice the difference.
The over-travel adjustment is like gilding a lily. Unless you're a competitive shooter (shooting in a combat venue), and also VERY bleepED GOOD, you'll never need it or know the difference. I shoot competitively and it doesn't really help me, I'm sorry to admit.
[The overtravel adjustment keeps the trigger from moving beyond the point necessary to start the firing cycle. We're talking thousandths of a second in saved time and fractions of an inch in saved wasted motion.]
Shoot your gun and enjoy it.