Like almost everyone here, I'm completely smitten with Octane; although I only use it for fun, so it's limitations aren't a serious issue for me.
Anyway, hope you enjoy looking at the pics, cause I've certainly had fun creating them

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Specs and all that:
GTX670
Some images direct lighting, some path traced.
Samples vary between 16k and 32k.
Render times, sorry I don't know cause I set off a render and go to bed. Although somewhere between 4h and 20h is about right.
ALL images have been post manipulated. I use Nuke and do colour corrects, blurs, glows etc. All aimed at enhancing the raw render, but still only possible because of the initial quality coming from Octane.