I also see more people with glocks
at idpa matches. The statistician in me tells me it's because of the numbers....... But I do think that you'll do better faster with a Glock than with a CZ.
Here's why. They'll both be in the same class. (grossly SSP = SA/DA and DAO and SA, other classes are SA only and 1911 and revolvers) I think that the consistent trigger pull of the glock makes it a more likely to shoot idpa better,quicker. You'd have to learn to master the dual trigger pull of the DA/SA with the CZ.
I think that Glocks are harder to shoot accurately than an SA, so the CZ might be a bit better suited for bullseye styled shooting. But IDPA is a combination of speed and "combat" accuracy.
You can learn to shoot the DA/SA well in IDPA. Many do. It just means that it might take more time or practice than the Glock. You can learn to shoot the Glock accurately, it too takes trigger time to do so.
Bottom line, all other things being equal (I still can't believe that one doesn't feel much better to you than the other, they are quite different) if you wanted to progress quickly in idpa the glock is the route. If you want to shoot accurately more quickly the CZ is the way. If you aren't in a hurry, either will get you what you want.
All of this is IMIO, in my ignorant opinion