R Bacon,
The numbers don't lie, go and have a look at GABI (AKL-DXB) yourself, then subtract about 235 (fuel with a low headwind component) from a MTOW of 575...and you get? 345 on a good day, then take off the DOW, and hey presto..PAYLOAD!
Now, hmmmm whats the average pax weight including bags out of NZ on a LH flight thats premium heavy, I'll let you decide, but it equates to about 100 blocked Y seats..ish, unless of course you want to be on the whale at BUBIN at 5am with no holding fuel.