Very interesting when J-20 and J-20A/S are put together in different light conditions. The top photo shows the undersides illuminated by ambiant light, the lower photo shows top sides by direct light from the sun. It is interesting that all variants have almost identical brightness and shade under direct light, but 20A/S have much darker shades than 20 from ambiant light. The reflectness of the new paint seems to be selective or sensitive to direction of incoming light, maybe due to polarization.