The P5s are, according to Kupa, all new meshes. P4 morphs will not work on them, nor will P4 textures. But from the images I've seen, they've addressed problems with the knees, elbows, and neck. Insofar as the quality of the characters, just remember that out-of-the-box Vicky is one ugly broad. As with her, it will all depend on what you bring to the characters you use.