Quality of life is a pretty subtle thing to measure. It’s not directly tied to the number of square meters in your home or how many cheeseburgers you can buy with an hour’s wage. It has more to do with the amount of fear and deprivation in one’s life. With a strong social safety net, low crime, strong employee protections, universal healthcare, inexpensive higher ed, plentiful time off, and a culturally rich environment with high social cohesion, Europeans live contented lives and don’t spend much time thinking about doom scenarios like what if they get laid off, get sick, or become a victim. Certainly they are jealous of American’s big paychecks and cheap iPhones.
The dark side of this is that wages and savings are quite low and the essentials take up most of people’s budgets, so something like the energy price shock can cause a lot of suffering. It’s sort of unthinkable in the US but lots of people sat in the cold last winter.