Cost of living in Essen (Germany) is 52% more expensive than in Zhenjiang (China)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 115 prices entered by 7 different people.
For example, you would need at least 元13,044 (€1,721) in Essen to maintain the same standard of living that you can have with 元8,600 in Zhenjiang.