Actually, on personal skill, they are better. Farm and objective focused, they out-gold players from other servers. Also, skill wise, utilising everything to the maximum is why the Koreans do so well. If you even just watch the lanes, you can see how rarely they miss a minion, that is a laning skill you don't find in other servers.
In response to the guy who said Fnatic and Gambit beat White (then known as Ozone), you should know that right after the last OGN before S3 Worlds, they decided to switch out their top laner (who is also their leader, play maker, and effectively their soul player), which just put the team in shambles. If you watch the games, Imp still won his lane, and I agree with most of the people here, Imp definitely deserves to go higher, he is probably the best ADC around in both S3 and S4, and if I remember correctly, he is the one who innovated the BotRK -> PD -> LW for Vayne which became the norm build for her.