This is of course a complicated question. The US has many tax jurisdictions and widely variable cost of living, and jobs vary a lot. But I could compare, say, a Google engineer in Paris vs Seattle.
A Google senior software engineer in Paris earns €168k per year (according to levels.fyi) and takes home €96k after a 43% effective tax rate. A Google senior engineer in Seattle earns €336k and takes home €239k after 29% taxes, a 2.5x increase in take-home pay. According to Numbeo, cost of living in Seattle is 15-25% higher.
Of course, in America you have to fund your own retirement. As long as the pensions plans remain solvent, "savings" are a lot less important in Europe.
Anecdotally, I know people who were able to opt out of working altogether after 10-15 years in a large tech company in the US. I don't think this is common in Europe.