Here is what the same pz3, created in PP2012, looks like when opened in P8. At first sight the position of the origin looks to be the same as when opened in P6, but on closer inspection the position is not identical. In P6 the cross point of the hair lies just outside of the mesh, where as in P8 it lies just inside. It's an orthognal view, so the discrepancy is not due to paralax.

The P8 Joint editor displays seven digets after the decimal point YEAH!(you need to scroll to see the last two), in P6, and in PP2012 Joint Editors, only three digits are diaplayed after the point BOO!. On the down side for P8, only three digits are being displayed after the point in the Parameter palette BOO!.