I expect a Switch port to look a bit less detailed, especially in textures. Generally, I don't expect the Switch version to be 1080p either (which these images aren't, but just saying).
ARMs was made ground up for the Switch by people most familiar with the hardware, whereas this would be a down port. It's not really the same. You can already tell such differences between the PS4 version and the PC version, for example.
Really you can just reference SamSho PS4 vs. Switch. Both use the same engine and have less realistic art styles. SamSho Switch has worse quality textures and characters have less detail.
It looks fine though. I think a lot like DQ XI, games that don't have such realistic art styles hold up better
Is Dimps behind SFV? They have UE4 experience on Switch thank to Sword Art Online: Fatal Bullet. Plus they own Safari Games who did Samurai Shodown on Switch funny enough.
Dimps had a hand in SFV, yes