Its economy, so do not expect too much. The noticeable difference versus US based carriers is the lack of curmudgeons among the cabin staff. I'd advise getting an Ambien rx to sleep thru the flight.

IF you an AAdvantage Platinum or EXP, you can use the Wing or the Pier in HKG. Both are great lounges and are well worth the stopover.

If you are not AA Platinum, consider doing a platinum challenge with AA (search the AA forum), assuing you are on a mileage earning fare with CX.