I found it interesting what sounds like a quote of CL's "MTBD": "수티수리 마하수리 수수리 사바하". It really jumped out to me. And there are other similarities to 2NE1: "Get on the floor" (very common lyric, but is also found in CL's work), plus "내가 잘..." (also those words are both common and form a different sentence than "I Am The Best"). -- No, I am not saying their lyricist is copying in a dishonest manner. It's a time-honored tradition to quote bits and pieces of previous lyrics to hook onto people's nostalgia for old songs...
