Cost of living in Essen (Germany) is 59% 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 87 prices entered by 8 different people.
For example, you would need at least 15,714元 (€1,977) in Essen to maintain the same standard of living that you can have with 9,900元 in Zhenjiang.