Not quite what you're looking for, yet still relevant: the UBS bank provides a (free) worldwide analysis of wages, purchasing power, benefits and the like

- 2009 study http://www.ubs.com/1/ShowMedia/wealthmanagement/wealth_manag...

- 2010 update http://www.ubs.com/2/e/medlib/wmr/pdf/Preise_Loehne_2010_e.p...

- web page http://www.ubs.com/1/e/wealthmanagement/wealth_management_re...