Cost of living in Essen (Germany) is 43% 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 960 prices entered by 149 different people.
For example, to keep the same standard of living that would require CHF 9,200 in Zurich you would need to make just about CHF 5,235 (€4,604) in Essen.