Business Week has Mercer Consulting's annual roundup of the global cities with the best quality of life. Sydney comes in at 10, one down from last year. Melbourne's at 17, a tie with Luxembourg. Aukland is fifth, right after Vancouver at 4.
Brussels comes in at 14, which is, euh, quite unimaginable. Brussels isn't a pleasant city to visit, let alone live in.
It doesn't give any info on how they compiled the list.