I have never shot a PTR or h&k and know no one with one to try.  So how is the trigger on a PTR 32? Is it like an ar15 trigger?

Are they better or worst then a Pap92? Ak47?

Best way I can describe a roller-lock trigger is that you have a smoothish pull that suddenly breaks, without a clear point of resistance before breaking like an AR or AK. Most of mine break around 5.5-7 pounds. The AK often has a two stage trigger, but some like the Tapco G2 trigger feel like an HK trigger.

You can learn the HK trigger, but the system is hampered by a lack of aftermarket options.