Not at all! 2k is still plenty sharp on a 15.6 inch display.That's an interesting panel!
However does downscaling the resolution to 2k make the image blurry and not sharp anymore?
What did you use to drive this panel? I can't find any driver board related to it on AliExpress.
The driver board was sourced from taobao, there are many sellers selling the same board design but here's a link to one of it: