Are there significant improvements in the graphics and sound quality?

Absolutely, Assassin's Creed Valhalla shines brilliantly in terms of graphics and sound design. The highly detailed environment, realistic character models, and meticulous attention to small details make the graphics visually stunning. Ambient sounds, the clash of weapons, and character dialogues are also immersive, enhancing the player's experience of the Viking era. Notably, Assassin's Creed Valhalla on Switch has managed to maintain the graphical quality to a commendable extent, optimizing the game's display to fit the console's capabilities.