I’ve started watching the new series from Prime, a Guy Ritchie production called Young Sherlock. All the episodes dropped a few days ago. It’s fast paced and doesn’t dawdle one bit introducing the character, because you already know who it is, which is nice.
It’s non-canonical in terms of classic Conan Doyle, and it’s based upon a separate book series, but in the first episode you meet Holmes’ brother Rycroft, and Holmes’ eventual nemesis Moriarity who is every bit as brilliant as Sherlock all within the first 20 minutes. It’s quite watchable.