Originally Posted by lionelhutz

MEL-HKG has a good chance of upgrades if you're in PEY, I imagine SYD-HKG is similar. The PEY cabin is small, so there's only 21 people to choose from if they want to move someone up. Also it depends on the flight, upgrades are more common on flights that don't suit business travellers (early morning and midweek flights especially).