Hey! Yes, I’ve heard both of them in SG.
I actually didn’t like the ProMission X as much between the two. It’s more V-shaped than the PP8, and maybe not quite in the right way for my tastes? Something like that, even if it’s the more exciting of the two. Not a bad IEM, but not great for me.
On the other hand, I really liked the PP8 despite not expecting to. The tonality on the PP8 is nearly impeccable minus the upper-treble extension; overall, I hear it as almost dead neutral with a hint of warmth. It’s just reminds me of a purpose driven, well-worn tool. Excellent detail retrieval and sharp imaging despite the average staging. The fit and comfort on the PP8 is also fantastic in tandem with the material they use.
I don’t know about them beating out 12t for me though!