It should just come down to the source files and the hardware. The Quest 2 is 1832x1920 per eye but with the FOV it probably can only really render 1080p video if you're watching it in something like BigScreen.

I use mine to watch 3D movies and it's pretty great. I missed out on seeing Avatar in theaters so being able to watching it in 3D without waiting for a re-release or anything is convenient.