The argument for Kobe hinges on two things - people claim that he is a better shooter and that he is more clutch.
It may well be the case that Kobe is the better shooter. But he is not necessarily the better scorer - and certainly not the more efficient scorer. LeBron might not have the pure footwork or shooting ability that Kobe does, but he is still a good shooter and can score in a much more efficient way - by getting to the rim. The drive may not be as pretty as the jumpshot but is far more effective if it can be utilized properly (as can be seen by LeBron's average of 42 points a game this series). The clutch argument has larely been disproven by the stat gurus at 82games.com - simply put LeBron has hit the most game winners in the NBA over the past 2 years and has a far better shooting percentage in clutch situations than Kobe. He also contributes more in areas besides Kobe in these clutch situations - rebounds, assists, steals, etc.
But even if the evidence is ignored, and Kobe is the better scorer and better clutch performer, that hardly makes him the best player overall. Since when was basketball all about scoring? What about rebounding, assists, blocks, steals, team defense, athleticism, speed, power, ability to finish, etc. Aren't these also crucial factors in evaluating the talent of a player? What about the intangibles? Sure Kobe has that killer instinct -that assasin's mentality - but LeBron has admirable qualities of his own - he seems to genuinely embrace his team no matter how undertalented they are and has shown flashes of that same hunger that we see in Kobe.
When analyzed across all areas, it is hard not to come to the conclusion that LeBron has at least equalled and more than likely surpassed Kobe Bryant. Both are legends in the making, but one's flame has the potential to glow brighter while the other's is clearly beginning to dim.