Quite similar. K100 feels just slightly heavier. Of course in SA the K100 is mostly staged, then has a few mm of creep, then goes off. The PPQ has a fairly long, very light travel, then hits a wall, then has basically no creep, then goes off very crisply. So comparing a staged PPQ to the SA K100 I'd say the PPQ feels a little lighter and has less creep. But the K100 is still quite good. Both have fast, short reset. Easier to work the reset for me (a novice) on the K100 b/c the trigger as an SA stays staged so to speak. I can shoot tighter, more consistent slow, aimed groups with the PPQ.