Well since everybody else has talked about build and comfort I'll just talk about sound and how it compares to the 1st version (I must clarify I bought this on my own and am nor in any way shape or form affiliated with kz)

Bass

The bass on the pr2 sounds very much like a dd and I really like dd bass so this is a pro for me, the sub bass despite having a lot of volume doesn't sound like it has too much emphasis which can be a good or a bad thing depending on the person
the mid bass and upper bass is clear and uncoloured while also not bleeding into the lower mids

Mids

The vocals and basically everything in the mids are quite forward and are quite uncoloured, basically think an hd600 but planar and in iem form

Treble

The controversial bit well let's get on with it, for my specific pr2 it's well the version 2 but somehow it has slightly less treble than the og pr2 which is odd because the og pr2 had the foam, but hey maybe just a specific model quirk, but the treble is extremely detailed and also very clear, absolutely smacks the dioko for detail despite them both being on the market for almost the same amount of time

Soundstage and imaging

It doesn't stage much forward but it does to the side and side forward/back pretty well and in that staging is some incredible imaging performance


Final thoughts

Honestly from the solid 2 or so weeks I've had this I will say it blows every pr1, the dioko, the pr3 (well the pr3 is a treble cannon so yk you use that to detect faults in your mix and the pr2 as your true reference iem, anyways I'm getting a bit ahead of myself), and every other iem, not just planars until like $160 out of the water and it's truly an amazing iem, not just for the money but in general

Truly deserving of S+ tier for under $200