And here I thought Corona was quite sufficient in this regard, because the transition between 0-1 in glossy seems "slower". In Vray, with Ward mode, 0.99 is like completely blurry suddenly.
Maybe this is something that could be alleviated altogether with more advanced ior model, or maybe blend two materials with peak reflection being 1.0 glossy, or simply use some slight scratch map in specular slots
instead of glossy value to give the off-blurry look.