1)Sorcerer's sleep skill last 30 sec's in China, it is less in Korea.
2)Kill a mob in the abyss and you get 13 AP's and maybe 2-3 stigma shards, In Korea the same mob will give you 175-200 AP's and a lot more shards (forgot the amount).
3) In Korea they have more NPC guards at outpost and choke points in the game.
4) Maps that are incomplete or blocked off are open in the Korean version.
5) more quests in the lvl20's making for less grinding.
chinese release is currently lvl 45 capped, while korean release is 50 capped with lots of features ( XP showing as a reward for quests, tons of quests implemented, more XP from quest, auction house upgraded...).
So chinese is 1 patch late (or 2 perhaps)
Enjoy