I did some further tests.
Seams like the Unreal Roughness get some strange change when you switch from Vray RT CPU and RT GPU.
The first screenshot here under is VR GPU with the Unreal Roughness and you can notice the smudge / splotch in the reflection.
The second screenshot is with VR CPU with the Unreal Roughness and you can notice the correct effect I want.
The third screenshot is with VR GPU with the Unreal Roughness inverted. You can notice that the color effect get off course darker but the pattern of the roughness get the same as the CPU version..
On the background, you can also notice how the asphalt gets blurred in the VR CPU version (second screenshot). (I've checked and I've disabled DOF).
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