I do this route every week and you are lucky to get a 767. The flights that I am on (morning and evening) are only 737s and they are almost always 90-100% full. I'm surprised that QF would put a larger capacity aircraft at a weekend and at a non-peak time.

I have been lucky to get domestic aircraft fitted with AVOD IFE on some flights. That's much better than the iPads and you get to watch it from the moment you board to the moment that you disembark.