Look, as someone said elsewhere, this is an impossible problem. You have too many factors to figure out. Have a family? Want to own a house instead of rent? Do you need a car? What lifestyle do you maintain?
The point here is that we're trying to assess what it would cost to maintain a similar standard of living in two different cities. Food. Transportation costs. Housing. Rents. Healthcare. Forget 52" TVs and trips to Paris for the time being.