Season 2 just dropped this week and the whole series is exceptional. I would say that each episode feels more like a Broadway play than a TV show. The acting, set designs, wardrobe, music and 'choreography' are as good as you'll find on any TV series. But the thing that really defines this series is the writing; there is a snappy patter to the dialogue that you just don't find outside of an old Woody Allen movie.
I always think that the production value of Amazon Prime series usually look a half-step below Netflix and a whole step below HBO. However, this series is different because everything is top notch.