/diy/ - Do It Yourself

안녕하세요~

Of the four languages I have only had some experience with three of them, so I can't comment on Vietnamese - I lived in Asia for 3 years and I plan to go back in a year or so.

Reading / Writing:
I agree completely with those saying the Korean alphabet is easier to learn - the Haerye says "A wise man can acquaint himself with them before the morning is over; a stupid man can learn them in the space of ten days." Hangul is awesome, learn it! :)
Kanji would drive me absolutely crazy, just try learning the 2000 needed for everyday use in Japan?! wft?! Chinese use mostly the same characters. fail.

Speaking / listening:
I don't know about everyone else, but tonal languages are extremely difficult for me. I could swear I was saying 'Shenjen' just the same as everyone else, but they really couldn't understand what I was saying - that frustrated me. So Chinese is out.

Conclusion:
Japanese is very easy to speak and to understand - if only it weren't for the writing system!
Chinese is difficult to speak, read and write. May you remain sane if you choose this path.
Korean is a little harder than Japanese to speak, but not impossible! Easy to read and write after a morning, or 10 days :)