Also a pk user here. I can praise the pk feel as I own 2 redondo mid, and they are an absolute bliss to hit with. Better feel than that frame. I know none. k90 comes close because of the intoxicating plow, but the Redondo feel is just sublime and it has some good power too, you just have to know how to swing it the right way (very fast swing and brush the ball violently at the very end of the follow trough).
Agreed to the 4d100, lower powered for sure, but an amazing scalpel in action. Touch and volley players use that racquet with a smile on their faces for some reason (bio version was a step in the wring direction).
Like another posted said, choose one to your liking weight, swing weight, string pattern… blabla bla and you wont be disappointed