This is a shot from the only camera I have (an htc one). I took the picture directly next to the tv as close as I could get. One is at 1080p and one is 1440p.
IMAG0113.jpg 847k .jpg file
IMAG0112.jpg 821k .jpg file
A little side note:
I tried GPU scaling on and off and it did NOT change the refresh rate. My panel identified it as 2560x1440 60hz both times and blur busters ufo test came up as valid 60hz both times.