Soderling hits his FH with spin until he gets a high or short ball, then he flattens it out and he does it brilliantly. Most of his winners are flat shots. He also hits his backhand without much spin. There are others who hits even flatter though. Golubev hasn't been mentioned yet.
Yeah but we're talking about rally shots here, the vast majority of pros can crush a high ball, Soderling gets more of them because of his aggressive rally shots so that's why you might have grown with that impression.
Berdych, Stepanek and Youzhny are guys that hit flat shots all the time, because that's how they were taught to play tennis. You find a lot of guys like this in the Central-Eastern schools of tennis, in the older generation of course.
Golubev and Blake are guys that like hitting on the rise, and even though those shots are mostly flat there's still topspin work on them.