[0d1n]

Originally Posted by tonygao

while you are at it, below is my latest match play. I am the guy in black.

whatever level you rate the above two guys, I am 0.5 lower than them for sure.

http://www.youtube.com/watch?v=a2NEVGX9orc

You are half a level below the guy in dark from your op. He has a better serve, a better forehand and maybe slightly more explosive movement.
The guy in white probably just has more match experience and better choice of shots/consistency.
Anyway, what I'm trying to say is that YOU are probably the 4.0, the guys in the OP are probably higher, with the guy in dark being clearly closer to 4.5 than 4.0.