Here's some related data I've been tracking for some years now.
The UBS Bank (Switzerland) regularly updates a study of prices and earnings in major cities around the world. You can see the details at
http://www.ubs.com/global/en/wealth_management/wealth_management_research/prices_earnings.html
The methodology for the Prices, or cost-of-living, part of the study starts with a shopping basket of the standard goods and services consumed by a middle-class household in Western Europe. They price each item at real stores in a specific city to create a local cost-of-living number for the specific city. An alternate measure includes housing cost (rent). The numbers are then converted to US dollars at the current rate and indexed so that the cost of the basket in New York City is 100. By this method all other cities' costs are presented as a percentage of costs in New York. Obviously, the exchange rate of the dollar has a major impact on the index.
There is similar data for Earnings that I don't track. As an ex-New Yorker living in Buenos Aires and earning mostly US dollars, the cost side of the study interests me most.
Below is my summary of changes in costs from 2006-2011, during which time Buenos Aires has moved up from the 70th to the 67th most costly city tracked, just after Lima and ahead of Nairobi, Delhi, Kuala Lumpur, Cairo, Manila, and Mumbai.
The latest data is from about a year ago, so the last year's 25% inflation vs. 9% rise in the dollar exchange rate will have a definite effect that's not yet presented. If there were no changes in costs in the other cities, the net inflation should move BsAs costs, including rent, up about 19 places, equal to Warsaw or Budapest.
More recent data should be published around July or August.
Apologies for the fuzzy image.