Weapons and warframes are now super-shiny / glossy and seem to ignore PBR. Easy way to check would be in the Leverian - check Atlas, Ivara and the Aksomati. Ember Prime, Frost Prime, Khora's diorama, etc. This occurs with HDR on/off but is more noticeable with HDR on.
Please have a look at Shattering Justice for Sobek - that weapon has been completely massacred.