This article from “Life time Income” covers a variety of issues, the absence of an assessment of the qualities’ of the models in place e.g. NZ Super/Kiwi Saver perhaps detracting  from the overall  survey results. If Australia received a B plus in the Mercer results (NZ not included) NZ may well have topped the poll

 

http://www.lifetimeincome.co.nz/news/news/2017/july/new-zealand-super-versus-the-world