Hallowed Jhen Moran's textures are HORRIBLE, there are huge framedrops (especially in Deserted Island), the water surface looks worse than the 3DS version's one, some armor and weapon textures look pretty bad. (nintendotoday.com)
Also, they say the game runs better on PS4 and has very few less framedrops. (n4g.com)
It looks clean and crisp on the Switch screen, as you'd expect, and there's not a single hint of framedrop going from handheld to docked at any point. (fingerguns.net)