As usual it's absolutely dependent on WHO ports it (some things like Doom '16 or Wolfenstein New Colossus look great (barring a few little reductions in gloss), but other fairly simple games get butchered at the optimisation stage. Devolver Digital always do good ports to switch.

I never played the pc version but Subnautica is easily one of the best looking games on switch, they did good work I think.