I have a 5700 laying here, but can't figure out where exactly OP wants measurement from.

If measured from the center of the spindle's splined clamping area on non-driveside to the theoretical center of where the spindle is pressed into the driveside arm, it would be asymmetrical from centerline. The non-driveside spindle clamping area is wider than the driveside's pressed interface.

I believe on more modern 5800 version (and 6800), the driveside is even shallower and more asymmetrical (designed with crankarm face being flatter for more shoe/heel clearance)...but I'd have to take one off to measure.