You need to add "cotisations sociales" (not tax per se, social security and such), which is I believe a 22% flat tax. So that would make 67% for the last bracket. But there are other differences. For instance, if you're married or/and have kids, you can have important benefits. Also RSUs are taxed differently.

Overall, tax is high in France, but not that different from other countries. Even in the US, certain places like NYC are heavily taxed. And you also need to see what tax gives you. I don't mind to pay tax if that gives me (and everybody else living here) access to healthcare, security, education or a decent future pension. Now whether France still provide these things is up to debate.