I've said this before, but on a Europe - NZ trip with back-to-back 12h flights PE is worth every penny of extra legroom and space.
Throw in that if you travel in a couple you don't have to share space with a stranger, you get full mileage, and you have increased luggage allowance, and I think a premium of 30% (which is what PE costs over flexi economy on the routes I generally use) is justified.
Yes, NZ's product is way better, but also more expensive.