I checked the QR website and HKG not down as mobile boarding pass location. Reading this thread contradicts this somewhat. I have a CX flight from China on a seperate ticket - would CX check a bag through to destination flying QR?
If I am sure a boarding pass will work I would probably use hand luggage anyway.
I get into HKG at 7pm for the late 1.25am flight and do not want to hang around landside for over 3 hours.