no, it doesn't scale correctly, changing resolution (those I tried) makes objects visually appear in different place than they actually are, be it armies or anything actually, meaning UI is garbled, sometimes "selecting points" appear out of screen, sometimes selecting one thing to produce in the city, adds not a selected thing but other. I also had to lower res couple of times to be able to see anything, so it can be you never encountered this problem, but it is there, UI sucks.
I don't like some other things about it, as too much clicking that can be done with less, but my main problem is that UI works properly only with certain resolutions. It would be nice it was tested and those resolutions that UI refuses to scale to, were not available at all, that could saved me from playing it!
well, I kid about playing part, I still would have played it.