That said, I also totally didn’t recognize it as Hamill’s voice until I knew to listen for it.
Kudos to The Mandalorian for finding a way to include Star Wars’ most iconic actor without making viewers think of Luke Skywalker, and to Hamill for participating!
Still, based on Mark Hamill’s other voice work (including the Joker in various Batman series, Skips on The Regular Show, and the big bad of Avatar: The Last Airbender), I think EV-9D9 is recognizably his voice.