Good perchance, I don't know much about displays.
Or in fact this one?
OK it will be one of these three.
All i can say is that 28" 4k will be bad experience. The thing is, the pixels will be really really tiny. And there is no GPU that can max out everything in 4k. 1440p on the other hand is the sweet spot... There are many GPUs that run games well on 1440p...
I also go for the 1440, it's a great res that a lot of GPUs can handle. 4k in my opinion, is currently a bit gimmicky and a sale point.