According to reports out of South Korea, some of the country's most talented (and fastest) players finished Diablo III in record time.
While Western players have also completed the game, in the race to finish it first (and fastest), Korean clan EHG defeated the final Diablo III boss only 5 and a half hours after the server opened.
Even though the clan defeated the final boss, it apparently could not obtain the in-game items due to, well, a server problem.
Warning: The source link shows what's reportedly the final boss.
디아블로3, 출시 6시간 만에 한국 게이머들이 '점령' [MTN NOTE: FINAL BOSS SPOILER]