http://uk.youtube.com/watch?v=ipsyWURr1yU IMO opinion Khan looks a little stiff, doesn't move his head enough, leans forward too much when he punches to the body, and lowers his defending hand whenever he punches. Pacman in comparison is smooth, mobile, has great lateral and head movement, keeps his defending hand up, punches without moving his body forward. Great experience for Amir though - to practise with an all time great can only do him good, as well as getting constructive criticism from a great coach.
nice find, khan's speed is very impressive, but then, we always knew that anyway... its a damn shame the kid has no punch resistance:-( he could be a real contender if he could wear a shot