Nah TV's are really good at upscaling. You'll be fine.

I don't recommend using a TV if you'll be using it close to you as a monitor, the pixel separation is a bit larger and the image loses some quality just because the TV is prepared for you to see it from a distance. Source: Happened to me.

1080p to 4k is just a times two upscale, so there is blurryness at all, might notice jaggies more, but thats it.

Hello guys. I am planning on buying a big 55" 4k TV to play my games on and using windows. My laptop is a gtx1050 so it can probably only run most games at 1080p with 30fps. Can I still use a 4k TV for that purpose? Does the image become mor3more blurry also, if its not native 1080p tv resolution?

Playing 1080p on 4k TV with laptops HDMi?