I'm biased, but after last year's Finals he sealed the deal for me. Greatest comeback in NBA history against a 73-win juggernaut, and put up monster numbers only matched by MJ's career-best Finals performance.
LeBron's 2016 Finals
30/11/9 on 49/37/72 shooting splits
2.6 blocks and 2.6 steals per game
Jordan's 1991 Finals against 58-win Lakers
31/11/7 on 56/50/85 shooting splits
1.4 blocks and 2.8 steals per game
LeBron's playing with house money now. If he's not #1, he's a clear #2 and still somehow the best player in the league after 14 seasons.
And his defense. It was the greatest offense+defense combo that we have numbers for and likely of all-time. Jordan had Pippen and Grant and then Harper and Rodman to help him. Who helps LeBron?
LeBron defensively in the playoffs was ridiculous:
Overall: 31.9 DFG%, opponents usually shoot 45.9%, -14.0%
Threes: 24.1 DFG%, opponents usually shoot 36.7%, -12. 6%
Twos: 36.6 DFG%, opponents usually shoot 50.5%, -13.9%
<6ft: 37.9 DFG%, opponents usually shoot 61.3%, -23.5%
LeBron defensively in the finals was utterly ridiculous:
Overall: 31.6 DFG%, opponents usually shoot 47.9%, -16.3%
Threes: 29.0 DFG%, opponents usually shoot 39.6%, -10.6%
Twos: 33.3 DFG%, opponents usually shoot 53.6%, -20.3%
<6ft: 38.5 DFG%, opponents usually shoot 63.6%, -25.1%