I will be traveling to Hong Kong on CX873 from SFO next month and was hoping for some advice in a few areas:

(1) I will arrive SFO from DFW on American around 7pm and have 6+ hours until CX873 departs at 120am. Should I take a cab into the city and grab dinner or perhaps hang out in the airport and CX J lounge prior to the flight?

(2) What kind of meal service do they provide on this flight given the 120am departure?

(3) Are the J seats comfortable enough so that I can get some real sleep?

(4) Is the return from HKG to SFO a better dining experience given it departs HKG in mid-afternoon?

(5) Should I plan on spending some time in the J departure lounges at HKG? Right now I am coming in from PVG with about 2 hours between arrival and departure from HKG?

Many thanks!