AOC is bringing a G-Sync monitor and a FreeSync 2 monitor to their Agon 3 series which both feature curved panels, high refresh rate up to 165 Hz, and response times as low as 0.5 ms. These 27-inch 1440p monitors are expected in Q2 2018.
https://www.notebookcheck.net/AOC-announces-two-new-monitors-in-wht-Agon-3-series-with-0-5-ms-response-time.244622.0.html
So.. Tn panels have a 1-2 ms response time and Ips has a 4-5 ms response (up to 8 on some really budget models) not the 5-60 you claim.