I don't understand what so controversial about saying Mario Kart 8 looks better that many Xbox One/PS4 games. It actually does and this was said when the game launched on the Wii U as well. Doesn't mean the Switch is as capable as those platforms, but some of same issues people complain about visually for Breath of the Wild is present in many PS4/Xbox One games. Just because a game has better textures, models, and AA doesn't mean it automatically is a superior looking game.
Final Fantasy XV has performance issues and some ugly textures here and there. Pretty game that can look and run terribly in spots. Compared to BotW with the latest patch with it's solid framerate, I prefer BotW visually even though it's technically not on the same level as FFXV. The visual fidelity is close enough between platforms now for it to be reasonable to make subjective observations.