The planes used to brisbane by JAL are older 2 class planes.We have always been in the main cabin so at the front.They are older seats so depends on your personal preference.
NRT-BNE on JAL is overnight so you do miss out on experiencing JAL service.I have used JAL now for 3 yars-tried qantas again 9/03 and went straight back to JAL.This is my personal choice and I know others disagree.