Oslo has overtaken Zurich to become Europe’s most expensive and the world’s 4th most expensive city, while Zurich has dropped to 2nd most expensive expat city in Europe and the 5th most expensive city in the world for expatriates as at July 2018.
https://www.xpatulator.com/cost-of-living-article/Europe-Expat-Cost-of-Living-Comparison_708.cfm
Expatriate International Cost of Living 