Note one problem: the stage reflections. Because of its angle, the stage disk center is showing us a reflection of the background LDR image, not the HDR. That reflection is dull.

Most people would probably not notice. But if instead of a little stage, that was a lake or ocean, we'd for sure think there is a serious problem with the reflection.

That's why I mostly just use the HDR images and a wide angle camera. 

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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)