Sorry for the delay in responding -- my day job is getting in the way of my hobby
I don't want to set off a firestorm, but the word "sterile" is one that comes to mind for me with regard to a lot of PP watches. Cleanly executed and of high quality, but perhaps too mannered.
My observation on these pieces is that there is a difference once you get into the true major complication range -- even between the 5070 and the 5970, there's a discernable difference in the feel and look of quality and hand-work. And a real difference compared to the PPs that I have owned (5015 and 5065).
Best,
Gary G