There are very real data difficulties in comparing wealth in different countries, but New Zealand stands out in the data we do have: we have a low ratio of wealth to income, indeed the lowest of the developed countries we've looked at.
Our numbers are likely to be understated - in particular, farms are not included in the data, and farms make up a larger percentage of wealth here than in most other developed countries. But even if adjustments were made for these factors, it seems unlikely to change the overall picture materially.