In my trip to Sydney, i re-routed through HK to try the lounges you mentioned. Definitely worth it
Hong Kong Cathay International First The Pier (gate 63) definitely worth it, they now having collaboration with Legacy House, an Michelin star restaurant.
Hong Kong Cathay International First The Wing (gate 1) is good too, so depends on where is your boarding gate.
Sydney Qantas First it's good, but most of the time crowded

For Doha
Qatar - Al Mourjan is very good, need to be revenue business ticket though. else the platinum/gold lounge. It was ok, but huge gap between this and al mourjan