Also most easily available statistics are from 2020. The US economy has been a massive winner post-Covid and has diverged a lot from some countries.
This website should be a good example. The typical Sr Software dev in the US would be in the top 1% to 0.1% of earners in European countries and Canada. The US has more millionaires than many entire European countries have citizens.
A top 10% earner in the US would be in the top 1% in Canada. An AVERAGE earner in the US is about top 10-15% in Canada.
Class mobility (or social mobility) indicates ability to go from lower to middle class, working class to generational wealth, etc... All income statistics show the US as having a particularly large amount of high income earners, self made millionaires (and billionaires), etc...