Tony - I have not actually flown in First on NZ, but I had a good look around at the First cabin, when I got shown around the jetbase at AKL last year. The cabin seats 12, and it is 2-2 configuration (2-3-2 is Business Class - perhaps you should check and make sure you have been seated in First, and someone hasn't made a stuff up). Seats recline to pretty much fully flat. I thought they were very comfortable, though I only sat in them for a few minutes. I have found J class service on NZ to be excellent, so I am guessing F class will be equally so. Take a look at http://www.airnz.co.nz/nz/ontheplane/first_class.htm
for more information.
I hope you enjoy your flight on Air New Zealand, and your stay in Sydney!
"So powerful is the light of unity that it can illuminate the whole earth." - Bahá'u'lláh