Here's each QBs contribution to his team's success.
YARDS
Brady (Plays for Yards)
- Passing Yards: 537 for 4,138
- Rushing Yards: 32 for 55
- Sack Yards: 32 for 187
TOTAL: 601 for 4,006 (6.67 yds per play)
Patriots Total: 5,174 yds
Brady's total contribution: 77.4%
Newton (Plays for Yards)
- Passing Yards: 395 for 3,062
- Rushing Yards: 111 for 480
- Sack Yards: 24 for 186
TOTAL: 530 for 3,356 (6.33 yds per play)
Panthers Total: 4,757 yds
Newton's total contribution: 70.5%
POINTS
Brady
- Passing TD: 33
- Rushing TD: 3
TOTAL: 36
Patriots Total: 46
Brady's total contribution: 78.3%
Newton
- Passing TD: 28
- Rushing TD: 7
TOTAL: 35
Panthers Total: 43
Newton's total contribution: 81.4%
TURNOVERS
Brady
- Int: 6
- Fumbles: 2
TOTAL: 8
Patriots Total: 12
Brady's total contribution: 66.7%
Newton
- Int: 10
- Fumbles: 2
TOTAL: 12
Panthers Total: 15
Newton's total contribution: 80.0%
Additional exercise
Based on a study I did a few years ago on turnovers, the field position change on a turnover, when the alternative is a punt, is about 50 yards difference, accounting for returns. So if you take these guys' turnovers x 50, that means that Brady's turnovers have cost his team approximately 400 yards of field position, and Newton has cost his team approximately 600. Subtract these numbers from their totals, and their respective totals are now:
Brady: 3,606
Newton: 2,756
So the fact of the matter is this. Tom Brady has produced more yards than Cam Newton has. He's produced more points than Newton has, even though Newton's team has scored more points overall. Brady has also been a bigger part of his team's production - both in yards gained and in points scored - than has Newton. Brady has done this with many of his best offensive players injured (Gronk, Edelman, LaFell (early), Lewis, Solder, Wendell), while the Panthers have been one of the healthiest teams in the NFL.
I think if Carolina stays unbeaten, and Newton keeps playing well, he'll win the MVP. But the cold, hard facts are that Brady has been a better player, a more efficient player, a more productive player, both in terms of raw numbers, and also in terms of his team's overall production. Brady is the true MVP.