Can the coming Canon 1D Mark IV win back those who switched to Nikon?

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Adding a Nikon to my gear bag means I am no longer a Canon only photographer. My main camera is now a Nikon. So what will it take to get me back to Canon?

There are many roads that got me to where I am, a gear bag full of Canon L lenses and a Nikon as the head camera. What happened? Will the tables turn again?

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