I actually just had to make a decision like this for a BNE-AKL trip I planned.

I found a well timed EK J fare for $600 USD to AKL OW leaving Sept 29 on the 773. The return leg would have been $800, but on the a380. I found a J fare OW AKL-BNE on NZ's 773 for $470 USD, booked via virgin australia. From what I've gathered, the EK A380 isn't worth an extra $330 (70%) for a flight time of this length.