I'm Chinese and I speak Cantonese but I understand Mandarin. Cantonese is fairly rough and aggressive, it makes it like people are shouting when they're not. Mandarin is more soft and gentle.
Korean..well, I don't really understand what word they're saying half the time, to me, majority of the words sound the same and it just sounds like one big jumbled word. But thats because I rarely listen to Korean. Only times I do listen to Korean is watching dramas (rarely happens).
Japanese is very