I couldn't find this information anywhere before I went and bought it, so I'm really just writing this to make it known that the UK copies of this game have an option to play the game in Japanese. When you start a new game, you can choose from English, simpler kana-only Japanese, and kanji-and-all full Japanese. Indeed, given that it was in Japanese first, why not include that option in the Western releases too? I salute Square for very admirably doing so.
Aside from that, this instalment always appealed to me as it's the only Famicom-era Final Fantasy that has proper main characters and the unique levelling system also piqued my interest. TOSE have done a marvellous job with porting the game to take advantage of the PSP hardware and it looks and sounds great!