The best looking portable FPS I recall was Killzone Mercenary for Vita it looked good on the original oled screen running in Vita's native res , so I wouldn't mind seeing how the more demanding Wolfenstein on Switch plays and compares.
It looks good on that small QHD screen indeed, but if you look at the actual game on a PC monitor at any sort of large res it really shows just how little power was in the Vita in comparison to the Switch, again this looked beautiful at the time but now after playing through Doom2016 on a mobile console it does look dated
as for the images in the OP.... man... I guess at least you don't need to worry about AA on those railings in the top right corner of the image on Switch... perhaps old BJ forgot his contacts? I'm sure it looks good in motion and that screenshot is one of the area's where the dynamic res is at the lower end, but that does look damn rough to stop and stare at but then again it is being compared to the higher end of premium console's graphics.