Nystul wrote:from unity Patch 5.3.1p1 patch notes: (none) - Shaders: Fixed a bug in Standard shader GGX specular term, introduced in 5.3. - that sounds related somehow
Also:
(none) - Shaders: More proper environment reflection in Standard shader for very rough surfaces.
The issue remains in version 5.3.1p1. Aras does not feel it's related to the Standard shader bugs that have already been resolved. It just comes down to whether this is considered a new shader issue.
In any case, not much is going to happen at this time of year. I'll just hang tight with 5.2 for now and re-evaluate in early 2016 once we know more.