Yeah for a game that was practically stealth-released (I wasn't even aware it was out and I follow Nintendo news habitually) they seem to have really gone the extra mile to make it look and run as good as it possibly can.
At first glance its hardly distinguishable from the PS4/Xbone versions, yet it still runs smoothly and has a pretty decent resolution. Definitely one to rank alongside Outlast II, The Vanishing of Ethan Carter, and Hellblade as among the best Switch ports of a realistically styled current gen game.
I only learned of its launch when this video came on my youtube feed. I don't recall them ever announcing the launch date. From looking at it online, its $5 cheaper on the eshop, typically that at least gets mentioned.