Cost of living in Katerini (Greece) is 60% cheaper than in Zurich (Switzerland)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 941 prices entered by 147 different people.
For example, to keep the same standard of living that would require CHF 12,000 in Zurich you would need to make just about CHF 4,823 (€4,198) in Katerini.