I'm seeing this line in my log as well, this person downloaded about 750MB and they don't seem to be on iOS 6.0.

  Reqs  User Agent
  5,378 Mozilla/5.​0 (Macintosh​; Intel Mac OS X 10_​8_​2) AppleWebKi​t/536.​26.​14 (KHTML, like Gecko) Version/6.​0.​1 Safari/536​.​26.​14