According to Knight Frank's new Global Wealth Report for 2015, London is still the most important global city for the world's ultra-high-net-worth individual (UHNWI), followed by New York and Hong Kong, but changing fortunes across the global over the past 12 months has seen Hong Kong and Singapore continue to slug it out for pole position in Asia.

Yet Miami, over the last decade, has quietly moved further up the list of the 'Top 40' most important global cities for the world's super rich. In 2015, Miami now is ranked number six worldwide, ahead of cities like Paris and Dubai.