The PPQ is not an "improvement" of the P99. It's essentially a different version. The P99 has an amazing trigger as well. It has the exact same reset. The only difference is it has a DA first trigger pull (and a very nice one at that). Some folks prefer that, some folks don't. The P99 in SA actually has a lighter trigger pull than a PPQ. The trigger is just as nice.
Yep. The PPQ IS
In fact, it's sold as the P99Q or P99RAD in Europe.