Leaving aside the defensive end of the floor, how would you compare Johnson's offensive game to Kevin Martin's offensive game?
The biggest difference to me is that Johnson shoots best off the dribble and has a very good midrange game while Martin is much better at drawing contact on drives to the hoop. Johnson has lift and can take the ball to the hoop but doesn't do so nearly as well as Martin who is such an efficient scorer largely because he does get to the line so well.
Johnson has a smoother shot with a higher release point and can get it off in traffic. But while smooth and quick, he's nowhere near the blur that
Martin has always been primarily a catch and shoot guy whether as a spot up or by moving without the ball and his quickness means that guys playing him tight would get backcut or see him drive past them to the basket.
Johnson can create his own shot much better and to me has a more rounded offensive game. He also is a much better and more willing passer.
I don't see Johnson putting up Martin like scoring numbers or being nearly as efficient in terms of the number of shots he needs to get his points. But very few players in the league are - that's what makes Kevin a good player.
I don't think you'll ever see Johnson in the top 10 as far as scoring. But I think he'll be a very reliable second or third option and the things he does besides scoring (passing, playing defense, rebounding) will make him a better fit alongside Tyreke than Martin ever would have been. And part of that is mentality. Kevin Martin sees himself as a scorer, and I don't blame him - it's his bread and butter and he's good at it. I think Johnson is much more willing to play the role that the team asks him to play.