At 1:1, closest focus is 7.5 inch but that is measured from the sensor. Subject distance in front of the lens will be about half of that. A bit less again due to the port. This parameter is not intrinsically dependent on sensor size and a 60mm APS-C lens, or a full frame lens if one existed, will have equivalent subject clearance. The reason that a full frame camera appears to lead to more working distance is that people use longer focal lenses to get the same field of view and, for instance, a 100mm macro lens will have greater working distance.
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