Originally Posted by
SilverChris
That's fine if you have an evening departure, but it isn't really an option for flights before ~3:30pm.
Yes there is! That's if you don't mind taking a bus with your boarding pass from the Jewel to the CX lounge in Terminal 4, especially if you're in the mood for noodles and self-serve Moet.
From the transit area in T4, you can take another bus to T1 to continue to experience in the Qantas F lounge that should be opened by 2:30pm.