I have only flown on the QF Dugong and from a pax perspective in J Class upstairs I was not particulary impressed....its a very open "barn" up there whereas the old 744 has smaller sections which make it more pleasant (personal opinion).How many J Class seats upstairs...72?
The double decker unloading system makes it a sh.t fight to get to immigration if you are in a hurry as all the Y pax disembark at the same time. Its no fun waiting 2 hours in line at LAX if you have a connection to catch.
Personally, I can't inderstand the Dugong's popularity with pax but maybe EK and SQ's are better configured.
Luckily my next US trip is scheduled (deliberately) on a day when "old faithful" will be doing the service.