The crystal on my VSF 124060 and black VSF 116500 is really, really good. The dials appear deep black, and the hands, markers and subdials sparkle. The crystal is as good as on my gens of various brands, free of any cloudiness.
The high quality is very obvious once I put my black CF 126500 next to them - the black dial of the Clean seems to be washed out grey in most light conditions, and the hands, markers and subdials appear duller (well, the subdials are duller than on the 116500, but they appear even duller). I have a white CF 126500 as well, and thought that the newer Clean crystals are alright, but the black dial shows how bad they still are.
Even the crystal on my dirt cheap Tactical Frog and on cheaper second-tier reps (M+F, APSF) are clearly superior.