[Brightcolours]

Foto Magazin had an AF test with a moving car under relatively controlled conditions in the August 2013 edition (they have done a similar test in 2008, I have it laying around somewhere).

 

Tested the number of shots in focus and the percentage of shots in focus, with central AF point and over a set period of time (multiple runs).

Short summary (number of in focus shots | percentage of in focus shots):

 

• Canon 1D-X: 25.6 | 71%
  
• Canon 7D: 10.7 | 63%
  
• Nikon D4: 18 | 72%
  
• Nikon D7100: 8 | 47%
  
• Nikon 1 V2: 42.8 | 91%
  
• Olympus OM-D E-M5: 6.8 | 38% *
  
• Panasonic Lumix G6: 8.6 | 57%
  
• Pentax K-5 II: 7.7 | 48%
  
• Samsung NX300: 9 | 56%
  
• Sony SLT-A99: 5 | 33%
  
• Sony SLT-A77: 1.6 | 9%
  
• Sony Nex-6: 3.5 | 32%
  

* They stated that during the test runs they noticed a fault with the Olympus. They stated they did some tests afterwards with another sample, but that the results cant be directly compared so it fell out of the comparison. They do not say if they feel the camera would score better, in their opinion, or not.