Comparing absolute numbers for income is a bit of a fool's errands, even when you use PPP.
The philosopher John Rawls has a famous thought experiment of choosing a form of social and economic organization without knowing where you personally might end up on whatever heirarchy it generates or contains. Rawls' point was that in such circumstances, most even semi-rational people will choose the one that makes it the most likely that they will not end up in a non-disadvantaged position, which is the fundamental concept behind an egalitarian to oppurtunity and inequality.
Given that, faced with a choice between:
1) a society that carries out substantive income/wealth redistribution so that few people (if anyone) has issues with a broad set of "basic" needs
2) a society that offers limited substantive income/wealth redistribution in the name of "high rewards for high achievement" or something similar
most people in Rawls thought experiment will choose the former.
You only choose (2) when you have reason to believe you will be a high achiever, which in a truly meritocratic society, you cannot know in advance.
So, the US is a society in which median (PPP) income is highest, but low income redistribution ensures that large numbers of people struggle to enjoy the things that US society considers "normal". By contrast, social democratic societies in Europe have lower median (PPP) income, but higher income redistribution means that far fewer people face such struggles.
Rawls would maintain that a rational person with a belief in justice would always pick (1), and that only irrationality or some (unfounded) conviction of one's own certainty of outsize success would lead someone to pick (2).