Don't see a single country [0] where that's true, and that's for average wages, which tends to be higher than the median wage. Mind you, the first infographic includes employer taxes as well, which should be left out of the discussion.
I live in Portugal and 40 to 50% on the middle-class is actually low-balling it by ignoring things like VAT, social security, the employers side of income tax and a bunch of other taxes.
[0] https://en.wikipedia.org/wiki/Tax_rates_in_Europe