Comes with the Mamiya 80mm f/2.8 autofocus.
It's on ebay now: http://www.ebay.com/itm/Mamiya-ZD-22-megapixel-80mm-f-2-8-auto-focus-medium-format-Dalsa-sensor-/290792276147?pt=Digital_Cameras&hash=item43b49200b3
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I believe the trade-in value is 22% off the price of a new Mamiya/PhaseOne so if you're thinking about the IQ series a small investment here may make for a large savings there!