When i watch 2NE1 i'm just amazed at the lack of improvement from the girls since their debut, apart from Dara. Dara seems the only one who actually improved her dancing and her singing over the years.
Although they were pretty well trained, and it's funny because my view must be the opposite of yours.
Bom has an amazing voice, CL is a great rapper and Minzy is one of the best dancers around...and then there is Dara. So I guess Dara improved the most because she had the most room for improvement.
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To put it another way, for me, Dara is the Dasom of 2NE1
j pop represent (T-ARA is also <3 Bye Bye is my favourite)
This is my personal favourite
or this https://www.youtube.com/watch?v=rMl40Cka4g4
I recommend Perfume on the Jpop side. Perfume are the true goddesses of the world