My personal opinion is that anything over 50% is too much. If I work hard and earn a lot of money I should at least be allowed to keep half.

That said, to reach the top income bracket and get a tax between 52-59.9% (Depending on where in Sweden you live) you have to earn somewhere around $80k/yr. Not entire sure about the number but it is in that region. I wouldn't consider that very wealthy, especially not if you live in Stockholm, expensive city to live in.