score:12
Note that first class and business definitions vary throughout the world. I flew '1st class' on Delta once and it afforded me an orange juice where the rest of the plane got none. Go figure.
However, one of the best is Emirates - business and first, and they fly their A380 between Sydney and Auckland, and Sydney and Christchurch (and Melbourne and Auckland?).
You can often nab AUD$800ish first class seats if paying outright, and that's upstairs on the A380, lounge access, 57kg of luggage, shower on board, amazing champagne etc etc. It's incredible.
If you have points (like I did), you can pay AUD$136 for a one way flight in First Class on Emirates from Sydney to Christchurch. It was fantastic:)