My favourite is currently the QF J lounge in HKG. I can't find a single thing wrong with it. Showers, sport on TV, excellent food, good coffee, comfortable chairs, good view, good wifi, lots of charging points, clean, close to security/immigration and excellent staff.
Others of note:
The Wing F in HKG, The Cabin in HKG, QF in SIN, QF F in SYD, CX in HND, JL in HND, Al Mourjan in DOH and The CCR in LHR.
Special mention goes to the old Premium Terminal at DOH. I loved that place.