Both will be players for a long time in the NBA. That much is already clear to me.
I think Langford could carve himself out an Andre Roberson role and earn a solid second contract. But I also think that CBS will bring his offensive game around slowly and he will end up being more like a Justice Winslow with the Heat or Delon Wright. I still have higher hopes for him than that, but I already see the path forward for him to become a long-term wing rotation player. He still needs development to get there.
I personally like what I've seen from Nesmith so far. I like his aggressiveness, even though its leading to a lot of missed shots and turnovers. I like some of his drive and kick and reset game that I've seen. I like his conscientiousness and work ethic on defense, even though so far that just means he gets taken advantage a lot and fouls a lot. He's much, much quicker and longer than I expected him to be, but I feel like his athleticism still hasn't caught up fully with his body. I have no idea what kind of player I think he will become. Tim Hardaway Jr., Malik Beasley, and Terrance Ross all seem like good projections, but its going to be a few years before he gets there, if at all. Still, I think he's an NBA player that will earn a second contract. He's the guy that I could see developing more and more throughout his career.