Of the FLounges that I've personally used:
1. MEL QF - simply superb. Wonderful dining, drinking, spa, business facilities, view etc.
2. SYD QF - along the same lines; not as good as MEL IMHO (busier, less personal service).
3. DUB EY - small lounge, v personal service, surprisingly decent eating.
4. HKG CX Wing - little too quiet/reserved/formal for my liking, though the dining was pretty good.
5. LHR T5 BA - nice and airy; food options a little sparse however the wonderful champagne bar makes up for it..
6. LAX T4 AA - brilliant buffet spread in the morning, lounge AAngels are lovely. Pity it's LAX!

7. HKG CX Pier - nice lounge, bit of a dungeon though .. no tarmac views.

8. SFO BA - nothing to write home about, but direct plane access from the lounge = awesome.
9. LAX TBIT oneworld - not bad, but gets v crowded in the evenings.
10. HKG QF - didn't much care for it; convenient for the gate QF uses but that's about it.