Flying CBR-MEL-TPE-HKG-MEL-CBR on a J Qantas ticket as a Qantas Gold. MEL-TPE on China Airlines. The rest on QF and CX.
The skyteam site says in Melbourne, China Airlines business class uses the Marhaba lounge, Qantas site says Gold with a QF flight number has access to QF int Business lounge...