I mean I'm personally contributing to 4 return journeys in the next month on CX W/J between LON and HKG.
All comments above have a case - but don't forget all those connecting traffic from Australia/ NZ as well; also office workers taking leave during low season to travel etc etc.
I just did LHRHKG last Saturday and it was super light load in J W Y - F was full
In conclusion, it is hard to say what contributes to the loading...