HK-SYD ranges 18k to 23k all in for "standard" Y+. Again why any monkey on this planet pays for this whilst ex TEP I-class is 16k all in is beyond my comprehension (well I guess majority of lucrative travellers don't really care). 10% bonus miles accural on Y+ as rumor was going. Funny enough to REDEEM Y+, you need to use 20% extra.
Airbus 333 map showing 2-3-2 abrest.
Assuming 40% discount for sale fare on Y+ that brings it down to 11k. For HK-SYD I'm a seller but I might take this for HK-YYZ