Roger Cicala at Lensrentals.com made a quick test to check the EOS 6D autofocus system. The center point accuracy is not different from the one featured on the EOS 5D Mark II. Read about the test here.
Support Canon Watch! I love to bring you all the latest news about everything that's related to Canon (and to photography). If you like what I am doing here then consider buying your gear by clicking my affiliate links. You won't pay a penny more and I get a small commission that helps keep the site going: Amazon, B&H, Adorama, Canon USA, Digitalrev, eBay. Thank you!