For those travelling J, definitely the CX lounge for the majority of your airport waiting time. However I would say that a stop at the QF lounge is also definitely worth it for two main reasons: the barista-made coffee and the gin bar experience. The flat white was lovely; they had run out of Green Ant gin at the bar last time I was there, but the Aviation gin is now in my to buy list and the bar attendant was really friendly to chat to.