I don't want to sound like an idiot, but my eyes sure can't see very much difference in all those images...yes a bit more shadows, etc..but overall they look like Poser renders to me....I really don't see all that much difference in P4/P5--time , yes, results not that much...at least as whether or not the new ones look any better....pretty much the same IMO.

Humankind has not woven the web of life. We are but one thread within it.
Whatever we do to the web, we do to ourselves. All things are bound together.
All things connect......Chief Seattle, 1854