Found this stat in the comments section of an article on ESPN.com regarding how the six potential playoff teams in the NL have all fared against each other so far.

Judging by the stats it would appear the Phillies aren't nearly as dominate as the record suggests and it may be a better indicator of their abilities to crush the opponents they should. I am not contending the Phillies aren't the forerunners (they most certainly are) but this indicates they may be more human than first imagined.

[Also incredible how good the Brewers ERA has been comparatively]

Brewers: 19-16, 3.31 runs allowed per game 
Giants: 19-16, 3.74 runs allowed per game 
Braves: 15-13, 3.39 runs allowed per game 
Dbacks: 15-16, 4.58 runs allowed per game 
Phillies: 14-16, 3.77 runs allowed per game 
Cardinals: 14-19: 4.88 runs allowed per game