One of my reasons for choosing this route to Sydney instead of the more obvious one across the USA and over the Pacific Ocean using a United or Qantas Boeing 747 is that Malaysia Airline uses a Boeing 777.
The center rear rows on the Malaysia Boeing 777 are five seats across. (Seat Guru) In most of those rows (but not all) the armrests can be raised to create a bed-like space roughly 8 feet long. It’s a bit narrow for a guy my size but still sleepable. 
I’ve yet to see a Malaysia Air 777 on these 7 to 10 hour flights anywhere near pax capacity. However, whenever I inquire at checkin about the flight load, I invariably have been told that the flight will be “full or almost full.” I think that statement reflects a capacity definition that requires them to fly with empty seats because the aircraft’s fuel capacity will not allow it to fly that distance whilst carrying a pax in every seat.
But the 747, with much greater fuel storage, can carry full pax load. So, assuming the ability of the airline to sell – and assuming the demand – empty rows on a 747 in this kind of service are less likely than they are in a 777.
It should be interesting to how this works out on the flights during this itinerary.
UPDATE POST TRAVEL: I have yet to see a 777 fly these long segments with a full pax load.
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