What rubbish you both speak!
It is a well known fact that Qantas customers do not like day flights back from Asia
dajop, I appreciate the humour.
Perhaps one of a few reasons why QFi has such a low market share on many routes is that unlike CX, D7, MH, PR, SQ and TG to name a few, QF tends not to offer the 'own metal' choice of daytime and night departures from either end. Remember, a day departure from Asia can nicely form a night departure from most Australian major airports (SYD with its 2300 hours curfew could be a problem) back to southeast Asia.
Many years ago, the railways in Victoria rearranged their country longer distance trains and offered a minimum of a morning, lunchtime and early evening departure. The number of travellers shot up hugely. Airlines like QF need to learn from examples like this, which some airlines have copied: SQ's spread of frequencies to SIN is pretty good from most larger Oz airports, and the patronage reflects that.
I would bet that changing the HKG timetables to give as close as possible 12 hours between flights, offering two a day each way, would increase ridership. Yields might even rise somewhat, all other things being equal.
Maybe someone from QF's operations or marketing sections reads these threads. I'd be the first to acknowledge that it is complex: equipment has to be available as do crews and QF may be very risk-averse with night time departures from SYD missing the curfew, but it does it with QF3 from SYD to HNL and to some extent with the HND-bound flight (latter is a bit earlier) while other airlines manage it and give a nice spread of their multiple flights throughout the day and evening.