I have a 1080p monitor and a 970gtx so I don't use 4k DSR on my monitor very often... but it looks a bit better on some types of games. However the sharpness of the overall image is decreased a bit using it. (it can be easily overcome using sharpness settings in a graphics injector)
If a game has a lot of grass and trees, regular antialiasing does't improve those if they are transparent/alpha textures... thats where supersampling improves them. But supersampling doesn't always work, or is a huge performance hit, or just may be incompatible with a game. Using DSR has that effect of supersampling but actually better performance and better compatibility of a game lets you run at that resoultion. In games i've run with 4k dsr, the graphics sometimes better than anything i can max out using similar supersampling.
I find DSR very useless on really old games that are really low quality textures and polygon counts. Even if you can run DSR with them its not even worth it since most of them don't have UI scaling and you will be dealing with tiny text and image quality that is likely the same as using some mild usage of supersampling. My favourite SS to use if i can get away with it is 8xSQ (2x2 SS + 2x MS), knocks out all noticeable edges.
I see what your saying though about keeping a 1080p monitor, since in 3 years from now, games could be more demanding and be harder to hit 60fps if you were stuck on a 4k monitor. I have no intention in getting a 4k monitor until i can buy a $500 video card that can do at least 80-100 fps at 4k. Even 60fps i find a bit sluggish in a lot of action games. It seems it could be around 2+ years or so before a video card i'm looking for will be able to do that. Even the Titan XP can't really do much more than 60fps, and even drops below 60fps in some games, in future games it will be even harder to max out the fps with even that card. Its not a futureproof 4k card is what im saying.
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