Bingowings said:
So much of Vader is the body language just watch the last reel of ROTS for further evidence.
I agree: I always thought ROTS's Vader lacked of... "presence" on the set. Not sure if it was Hayden's performance or his armor (which looks pretty slim compared to the OT ones). Funny that Prowse doesn't need to speak (much) to make a good performance, which is true for his work in the OT, but also for A Clockwork Orange :D