So...yes and no. I wouldn't say it moved further than the book, so much as...expanded everything -- character development of every single character, the detail of side quests, the cinematography, &c. You got some necessary updates, but also TV shows have to do TV show things, so every cast member has to be in every episode (mostly). At least, for the duration of the story arc.
It has gotten quite meandery, and somewhat slightly bloated. At least it doesn't fall into the trap of Westworld, where it gets so abstract I'm not sure what the intention was.
And yes, Ian McShane gets to sing in one episode again, just like he did in that one episode of Deadwood.