Did I notice a big difference? HELL YES!!!
I did NOT expect this. I had always thought 1440P is over hyped. I was going to wait for those new monitors with G Sync or purchase that ASUS 1080P 144Hz monitor. But I remembered I was using a AMD system, so I figured it'd be pointless. And when I found out these Korean monitors are selling for $300-$350 range I still was skeptical... Then magically, I found out it's possible to overclock the refresh rate on most of these monitors. Particularly the QNIX QX2710. That sold me right there.
I not only noticed the graphics looked better, I noticed my sniper accuracy had gone up.
The only problems with these Korean monitors (or my QNIX in particular) is the stand isnt adjustable, so it sits at a tilt, and the chance you take when you make a order them. You could be the 1 out of 99 that got a monitor with a slight defect. Luckily, I have no Back light bleed that I can notice, and I have no dead or stuck pixels.
Here's the seller I bought my monitor from!
http://www.ebay.com/itm/PERFECT-PIXELS-Matte-QNIX-QX2710-LED-27-LED-Monitor-2560x1440-for-USA-/321205794938?pt=Computer_Monitors&hash=item4ac95b787a
I have a hard time playing at 1080P now, it just doesn't feel as smooth. And you don't realize just how much detail goes into these games till you have this many pixels in a 27 inch screen. lol. I can't fathom 4K. QHD is good enough for me.