Originally Posted by DArtagnan 
The only thing I can't know with certainty is the exact resolution (or corresponding resolution their scaling is) amounts to. It's just a guess that it's around 1280x720. But what I DO know - is that if it's not "zoomed out" - it's because they're scaling it to your resolution and that's visually identical to using a lower resolution. As in, 100% identical and not 99.9% identical.
Yes I understand that it's being filtered down to compensate for the higher resolution. That doesn't change the fact that the UI looks significantly better now, and the zoom allows you to choose between a sharper res or a closer view whenever you want.. rather than being forced to pick one or the other in TuTu. That's a significant advantage any way you look at it.