I wouldn't compare a single prospect to Barkov. He had all the skill and obvious size when young with a bit heavy skating as his issue. He later on fixed that.
But the thing is, his arsenal is one of the broadest in the league if not the broadest. Skill, size, responsibility, and most of all he plays a winning type of hockey. Not only to showcase his own skill and greatness. Therefor I wouldn't compare prospects to him because that's not fair to expect. His game is so well rounded, effective, calculated and skillfully impressive. You can't expect that from most if any youngster.