I have a Pre B CZ85 (CZ75 with ambidextrous safeties and slide release levers.)
When I got it the insides were full of old oil, powder residue and a fine tan/light brown dust that had mixed together to form a sort of paste/mild abrasive. Under the grip panels, where there was no oil/lubricant the dust was just a powder of tan color. The barrel was pitted, the chamber was pitted (corrosive ammo? Hard to believe there was enough moisture in the middle eastern desert countries to cause pitting in the barrel/chamber.) The finish was in pretty bad shape and there was some pitting on the outside of the slide around the grooves milled into the slide to help you get a grip on it.
I tore it down, cleaned it up, replaced the springs and the barrel as well as the front and rear sights (forgot to mention the front sight was damaged.)
It is an extremely stout design. It feed 115 grain hollow points 100% for me. No issues.
Stout design....one day I had a case head separation while practicing with it. I had no idea what had happened until it would not chamber the next round. I racked the slide back and it still didn't chamber. I looked at it closer that time and saw something funny on the bench in front of me - the whole rim/base of the 9MM case. I dropped the magazine and could see the next round (3rd from the top when the case in the chamber blew apart) was covered in powder residue. I locked the slide back and then I could see the curled remains of the bottom of the case walls still stuck in the chamber. I field stripped it, pulled the case out of the chamber with my finger/thumb nails, put the pistol back together and kept shooting it. Zero damage to the pistol. Took a little extra cleaning inside when I got home.
Not sure what would have happened if it had been a plastic framed pistol.
Since that happened I've bought seven more metal framed CZ pistols in 9MM and .40 S&W. Oops, make that 8. No issues with any of them even though they are later CZ75 types.