When you check in for QF008 BNE/SYD you will be checked through to your final Asian port and won't see your luggage until you arrive there. You will have your passport checked in BNE, then in SYD you will just do a transfer security check.
This is actually a much easier option if you do have to travel to Sydney for a flight. Much like the extinct QF082 ADL/SYD, which was great to then travel on to NZ, USA etc