To put it simply Choi is one of the best judo fighters to ever win the Olympics. He won the olympics with style by winning every fight with an ippon score. He beat the likes of Sobirov from UZB, Hadjakhonzadeh Iran, current world champ Houkes from Ned and the highly rated Paischer Ludwig in the final.
I trained with Choi in korea 2 months out from Beijing Olympics and he threw me over and over and over again. Maybe 20-30 times a day. He is just so fast and can adjust to your positioning so quickly, but after fighting at the Olympics and seeing him win you could tell he was on the day just that level above everyone else.