It's no surprise that Durant has won, as he again led the NBA in scoring and led the Thunder to the second best record in the NBA. He went on scoring runs and put on a show on a nightly basis. LeBron didn't have a bad year, Durant just had a better year.
It's a tough argument to be made because many people still refer to LeBron James as the best basketball player in the world, but no one can deny what Durant did in the regular season for the Thunder. He averaged 32 PPG, 7.4 RPG, and 5.5 APG. His all-around game has improved and he is rewarded.
With the struggles the Heat went through, and no notable extended moment for LeBron, he didn't do enough to gather a 5th MVP Award. The Thunder went 59-23 this year while Miami went 54-28. LeBron averaged 27.1 PPG, 6.9 APG, and 6.4 RPG while shooting a career best 56.7% from the field. James was fourth in the NBA in FG%, and the only player in the top 25 in FG% that isn't a PF or C besides Dwyane Wade (54.5%). LeBron was third in the league in scoring.
It's obviously unclear at this point how the voting went, but that should be out soon. Expect Blake Griffin to battle LeBron for second place votes.
The NBA will probably officially announce Durant as MVP either on Monday or Tuesday.