And here, the same but now lit by the IBL instead of the EnvSphere. I still used IDL here, so that it is actually IBL+IDL, not IBL+AO. That's why it matches.

Anyway, I really don't get why you want this. It looks totally wrong to me. But there it is.

No reflections of the environment sphere because there is no environment sphere. But the quality of the light is the same.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)