I took screen shots, but the forum isn't letting me upload them directly or attach a file. I don't have a server to host the image. Putting in the file as the location doesn't work, so here's a description in more detail:
The map and units look great in high resolution, but the menu text and info like the unit stats are hard to read due to how small they are. The fonts look like they are staying a fixed number of absolute pixels, making them appear much smaller on a 4k monitor than they would on a 1080p one. The graphical models in game look fine, but most text (for example resource counts, the date, and army stats) is really small. I'd probably play this game a lot more if I could scale the UI like I can in say Endless Legends. If it's not possible now, I hope that feature is added very soon (the release notes made me think it was in, but maybe not.) Thanks!