Just watched this in preparation for Season 2 coming out later this month. I enjoyed it quite a bit. Didn't hurt any there were a couple seriously attractive women without much clothing part of the time.
It appears mostly different cast for Season 2, which I guess they can get away with due to the Sleeves.
It's based on the books. So yes, a different sleeve for Kovacs, but completely different setting (world) for the second season (based on book 2). Just characters shown in flashback would be the same.