Sitting in the lounge now in Terminal 4 waiting for QF16. I was really expecting a sh@*hole after ready the forum but it is quite spacious and bearable.
T4 isn't Tom Bradley though, which is what this discussion has been about. The T4 lounge was refurbished sometime ago, and although it is clearly an AA lounge I beleive Qantas chipped in some money to try to bring it up to Qantas standards. That was of course when Qantas had more flights out of T4.