If you're flying QF then yes, they should. There's a lounge that serves several airlines; I entered with a CX Diamond member once. It's decent enough though not to the level of any QF Club I've been to. One thing I'd mention, though, is that since it's staffed by airport staff and not QF staff, they may not be as familiar with each airline's lounge access policies. My colleague took a while to convince the staff that I was an eligible guest for him even though I was not departing on the same flight as him.

IME airports where check-in or lounges are operated by staff other than those of the airline with which you're traveling are often less clear on policies like this (I guess not too surprising).