Vulkan is super blurry on my TV. Haven't gone back to it. Sticking to DX11 for now, which is really sharp and nice. I think it comes to the fact graphic cards don't handle some parameters well with it, like image quality.
I have a different issue with Vulkan in BG3. It causes my FX8350 to overheat to the point it causes a thermal shutdown, which I find odd because my RX Vega 64 should have no trouble handling anything Larian can do in Vulkan. DX11, however, works just fine and causes no thermal issues whatsoever.
