Technically there's 10 lounges at T1
QF F, QF J, EK, SQ (Could even be considered 2 with F section), NZ, Amex, The House, Skyteam, Plaza Premium departures, Plaza Premium arrivals.
I actually don't think this is a bad assesment of at least T1 (based on their criteria)? It has a massive luxury goods precinct which is a critical part of what this survey looked at with beautifully designed flagship stores for some mega brands. Below is the metrics used and the top 10. The luxury brand weighting pushes Sydney way up this list. The champagne and caviar score seems ridiculous as it's either a yes/no to their existence, but from my memory Sydney no longer has a bar like this?
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We analysed 1,800 airports, scoring them on everything from designer shops and high-end hotels, to reveal which global airports are the most luxurious.
www.allcleartravel.co.uk