Cathay Pacific Business Class Lounge has got the definitive word on airport lounges to date. Having a business-class seat allowed us the use of their prestigious business-class lounge before our flight. Other ways for lounge access is having an elite status in Cathay's Marco Polo Club, Cargo Clan Elite, or One World Emerald or Sapphire status.
The Hong Kong lounge has shower facilities in a spacious setting. This is definitely first-class, being able to shower and relax. The showerhead gives a generous water flow, and I just lingered in it to enjoy the experience while cleansing my sticky self. It was truly a luxury, included with a business class ticket out of Hong Kong.
Afterwards, there are spacious work stations with PCs, or you can work off your own WiFi-equipped laptop in a large, spacious lounge, with a bartender able to provide a pina colada or small, pre-made sandwiches.
I love being pampered. This is what airline lounges should be measured on - spacious shower and peaceful lounging facilities, and great service, first-rate and truly world-class.