Cost of living:
Be very careful. What looks ok today is below par tomorrow.
The blokes from the southern hemisphere, be it SA or BZ, will find a better life in the pit, no doubt. But then we are not talking cost!
If we talk cost, my honest conviction is, that as for the moment EK is just barely covering the daily cost for a FO with a wife that does not work. That is if you live a quiet life without hobbies.
If you add kids, then you will go backwards, as the money simply does not cover a life an average pilot expects. (examples of a simple life are to be found above).