the OW F lounge, the CX J lounge, the BA/QF J lounge are next to each other, on the same floor.
you can check out each of them.

but i think the F lounge is still the best, and so too crowded. of course the F lounge has the best quality.
if u are flying QF, the CX lounge might be less crowded and worth trying. to me the snacks in CX lounge is always better.