How big was the largest XPro1 print you've sold?

I have a friend who sells very large prints and is now getting ready to upgrade his camera. Thinking 5DmkIII and D800. Should he be looking at the XPro1. he does nor shoot anything in motion and prints 3'x2' and larger. He is not tied to any system lens-wise .

Many thanks
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Anticipate the Light and wing it when you get it wrong

Tom
http://taja.smugmug.com/