In seriously surprised you can't tell, it feels significantly smoother for me to see a high refresh rate display. 60hz just looks sluggish/slow and wrong to me now. I had a side by side of the same monitor (was at a lan) and was watching my friend play and couldn't understand why his game looked so laggy untill I realise he had high refresh rate off. Turned on 144hz and it was so much better
That may have very little to do with refresh rate itself, and far more to do with the image processing and latency introduced by the monitor in different video modes.
