True. Looking at the entire scene posted above the subject (the tree) is not at infinity it's just a few meters distance.Focus is performed manually and thru the lens with a technical camera. If it's sharp on the ground glass, it's okay (admitting the back is well aligned with the ground glass).
So I don't really understand how a lens should be calibrated for a technical camera ?
But as to the calibration in general you have to see if the lens really is set to infinity. Mine was exactly calibrated to the default Contax mount - Cambo in the Netherlands is just a 2 hours drive from my home town so I visited the factory for adjustment and in their calibrator it was accurate. But it was not accurate to my back - it focussed wider than infinity. So we made a quick fix at Cambo but at home I adjusted it by myself again. As far as I know this is not uncommon... the contrary, as with the digibacks the tolerances are far smaller.
Regards, Thomas