UBI has to always be talked about with the way you are going to fund it via tax.

This article says higher income would be better off. But no, they would be worse off as over some magical amount you'd be paying out more than you'd get via the UBI.

However paying for UBI can also be done via a wealth tax. This would be ( theoretically ) the nicest way to evenly tax the wealth distribution of a nation then smooth it over the the entire population until you pull everyone up over a certain poverty line.

But a wealth tax would not be popular, and could be hard to implement effectively.