Obviously this was a major point of discussion earlier in the thread, but having not reviewed many Fstorm renders at the time, I felt a little left out.
That being said, I cannot deny that on average the Fstorm renders I see just look more photographic. That's not meant to be a referendum on Corona Renderer, or FStorm, or meant to imply one renderer is superior, etc. - it's just an observation. I follow the FStorm FB group and the Corona Renderer gallery / Instagram on a more or less daily basis.
It's possible that observation is a sort of sampling bias with more users rendering with Corona Renderer than FStorm and maybe there is a concentration of expertise in the FStorm user base because more expertise is required to operate a renderer with less documentation, tutorials, outreach, etc.
The particular look of the two renderers is somehow noticeable though.