"There is nothing P4 can do that P5 can't..." Not true. Aside from what's been mentioned, P5 can't: 1) handle more than 3 or 4 mil characters & textures without bogging down, 2) switch rooms quickly and smoothly, 3) be used all day without locking up or needing a restart, 4) render as fast with the P4 renderer, 5) etc.