Hi guys, my wife and I are flying into Hong Kong at 3:35pm in Y and flying out the following day at 9:35am in F. Will we both have access to all the Cathay and Qantas J lounges and the Cathay F lounge? We are tossing up between leaving the airport and staying in a hotel overnight in Hong Kong city or roughing it in the airport.
I would be going into the city. Train to Central and a 5 minute taxi to any one of a number of good hotels in the (sub)$100 range (JJ Hotel - through booking. com, or the Metropark Wan Chai - through the hotel's own website).
As others have said you'll be there by 5 and can have a meal and a good sleep ready to enjoy your flight the next day. For a 935am departure I'd be leaving the hotel around 630, gets you to Central and on the train around 7. At the airport and in the lounge by around 7.30. Time to enjoy the F wing.
As a CX gold you are OneWorld Sapphire. You have access rights to any oneworld lounge prior to the departure of your flight. This would include the QF lounge if it's open. If you are departing in F, you will have access to the F lounge.