On the EZE-AKL-SYD route QF operates B747-400 a/c usually configured 14P/79J/265Y. Economy seating is comfortable for an averaged sized person. I'm 5'8" (172cm) and have plenty of leg room in Y/C, ie if I were in the aisle seat I wouldn't have to necessarily vacate my seat to let the centre or window seat pax out as there is space.
Scheduled departure is currently in the wee small hours of the morning so there won't be a bar service after take off, though drinks are always available on request. The idea is to get a meal to all pax as quickly as possible, clear away afterwards and then let everyone sleep. En route to AKL a second main meal and smaller refreshment will be served not necessarily in that order. Ex-AKL you'll find breakfast served on the flight 'across the pond'.
Crew provide socks and eye shades for Y/C pax and of course J/C and P/C receive their amenity kits.
I sincerely hope you'll enjoy your flight with QF to Australia. Cheers!