The CZ 452 rimfire rifles are IMPRESSIVELY built and INSANELY accurate. The new 455 don't appear to hold to the same standards, unfortunately.
I think you're going to like the CZ handgun. Outside of one "Nazi Capture" CZ27 that was in HORRIBLE shape when I bought it 22 years ago, every CZ product I've owned has been over built / reliable / high quality with good attention to steel quality, etc.