Sharon,

Even though you probably have plenty of reports on the following hotels, here is my personal opinion and info on them. FWIW, I'll be back at the JW next month:

Hong Kong / JW Marriott
Lounge open 7 days a week
Internet is free for all MR members throughout the hotel
Great lounge, awesome food spread both morning and evening
Last stay - May 2011

Hong Kong / Renaissance Hong Kong Harbour View
Lounge open 7 days a week
Internet is free for all MR members throughout the hotel
Two level lounge with excellent harbour views, excellent food spread but not as nice as the JW
Last stay - March 2010

Hong Kong / Marriott Sky City
Lounge open 7 days a week
Internet is free for all MR members throughout the hotel
Very large lounge, food spread no where near as lavish as the downtown JW or Renaissance. Lounge and food quality seems more on par of a nice US property than an Asian one; however attentiveness of staff is definitely up to Asian standards. But none of this is surprising as this is an airport hotel.
Last stay - May 2011