I think the FOV will stay the same at that point, so you won't see more, but i never played at 2560x1440.
The graphics benefits a lot from high resolution though. I play with 8xSSAA at 1920x1080 res, which basically means rendering at 4x resolution... so something like 7000x4000. And the image quality is just so much better... mostly objects at far distance or vegetation...
I made some screenshots if you are interested, not sure if you see the difference or it's just me.
https://u.cubeupload.com/Shing/rohanclient201509072.png
https://u.cubeupload.com/Shing/cb5ro...t201509072.png