Some new CZ triggers are gritty. Some are so-so. Some are pretty nice. (I picked up a ANIB 75B .40 recently that was just about ideal.) There's no predicting which you'll get. Most of them smooth up pretty nicely after a couple of hundred rounds. You can dry-fire too, (use a snap cap) to speed the process.
The only way to get rid of the camming, which IS more pronounced on some of the newer guns, is to have the sear/hammer interface angles changed -- which someone using jigs can do easily. Jim Miossi, who participates on the CZ forum does it, as does Mike Eagleshield, Matthew Mink, and Angus Hobdell -- all very competent gunsmiths who know CZs inside and out.