Well as a Sapphire you can employ the [open] oneworld J lounge of your preference. At HKG this included the Wing/Pier - I personally would not bother with the BA/QF Lounge.

At BKK I do not know which lounge RJ may employ.

JAL have a lounge but I have not seen it - more here: http://www.jal.co.jp/en/inter/lounge/asia/bkk/.

The QF J lounge is OK- it's across the concourse from the CX lounge and far better. This does depend upon the time of your flight and whether the lounge is open.