For me, a native japanese guy, learning chinese characters is just a piece of cake (except for their pronunciations), and the same could be said of chinese people who learn japanese. simplified chinese characters are slightly different from japanese kanji, but this is not a serious problem when learning.. Chinese cuz of all their characters.. japanese because they have hiragana, katakana, and also kanji.. korean just have their hangul alphabet which isn't hard to learn. korean reading is fairly easy, same with pronunciation and speaking.. but i mean my first language is arabic so i don't have the. This actually extends further than chinese and japanese. korean also uses chinese characters, calling them hanja (한자), and the pronunciations are somewhat different again (although closer to chinese than japanese, as far as i know)..
Korean - as much as i love k-pop and some k-dramas, the language (for me) is somehow difficult to learn . japanese - a bit easier to learn compared to hangul . chinese - i know the language since i was a kid because of some family members.
