Jacking the envsphere up to 8X blows the exterior details. But, rotate the exterior details out of camera and you see indirect lighting looking pretty good.

Notice "Indirect fill" seeming to behave. This is all envsphere. The sky is shot. That's why we were messing with 2 spheres... one to cook the light, the other to produce correct reflection. But I do not know how to emit without being visible in RayTrace and hence,,, cooking the reflections.