CZ has been building handguns since at least WWII, and the P-09 is the same fundamental design concept as all the others, just with a plastic frame. I wouldn't have any reservations about its ability to shoot lots of rounds with minimal parts breakage.
CZ has been building guns for many years -- before WWII -- but the handguns we see now have a different heritage.... Lots of things changed when the Communists took over, factories closed and started building motercycles and heavy equipment, etc., and changed again when the Communist system went away. The P-07 and P-09 are GENERALLY
similar to the newer generation of CZ-75s and CZ-75B models, but more different than many realize.
The P-07/09 is a subtly different design, using a different barrel lockup design (like a SIG, locking into the slide (in the chamber area) rather than barrel lugs locking into the slide in front of the chamber), and the fire control mechanism is quite different, simpler (and more adaptable) using the new Omega design. Not a lot from the older design seems carried forward with the new one. (The mags from older CZs can be used in the P-07, but not the P-09 -- and they can be pricey.) Except ergonomics -- which are quite good -- very CZ.
I've had a BUNCH of CZs over the years, liked all of them, still have one (CZ-85 Combat), several "clones," AND a P-07. I really like the P-07. I bought mine used and it didn't come with the parts to switch from safety to decocker; mine is safety-equipped (which I prefer). The newer P-07 and P-09 can be user-switched from safety to decocker or back, and have grip inserts to adjust fit in the hand.
I've shot a number of H&K guns, but have never owned one -- so I'm not a good judge when making comparisons of CZ vs H&K. I can say that the P-07/P-09 offer great value for their prices and as I get older, that is an increasingly important variable in all of my gun choices. (I've had some very pricey guns over the years, and they were all sweet, but... I don't have any of them, now -- and it's unlikely I will in the future.)