LeBron is the best player currently, and can't be compared fairly to MJ and Kobe yet because he hasn't played enough basketball.
Durant's game evolves every year. There has never been a player quite like him. He's not as good as LeBron, but if it was a one on one tourney I'd take him against anyone.
LeBron's passing is what really sets him a part from the others. It's not system either. He is one of the best passers, scorers and defenders the game has seen.