I would've thought it would depend more on when the next repaint was due. Considering none of the remaining VYx series have been repainted since delivery in January 2006 (VYL; earlier, obviously, for the others) and VZR not since delivery in August 2011, I (like most of us) would have expected the VYx then VZA-VZE and ZQx to be done before the likes of VZR.
Perhaps this says something of the quality of the paintwork and finish on the respective deliveries.
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