We've just completed our review of Canon's EOS 70D - the ninth generation of the company's enthusiast-targeted series of DSLRs. With its Dual Pixel AF system and built-in Wi-Fi, it's an unusually radical departure for a series that's tended to progress fairly conservatively between generations. So how well does it work? Are these high-tech additions enough to fend off the competition from Nikon's very capable D7100 or Olympus's rather impressive E-M1?