Well paid but not upper class. Give Germany has a bona fide upper class, this is a meaningful point to snuffle about. The couple with €5,160/mo. in net income is still, in all likelihood, beholden to their employer.
And the comments in this thread are disagreeing with that terminology. (The term of art has been “high earners” when I’ve seen income statistics in America.)
That would put you close to the 1% of the top earners in Finland. Even most mid-sized company CEOs don't make nearly that much.