Hey, nice to see you again, Morbid =)
Usually I add some noise reduction in PS ( both in VRay and Corona).
But, believe me, for the same noise, with Corona I have 1/2 rendering time in most of situations.
And, finally, I don't have to struggle with sub-pixel mapping ^___^ . You knwo what I mean. Complex light situation is very easy to solve in Corona.
Situations where was impossible with VRay. And I worked 10 years with VRay!
I don't have to fight with subdivision, AA, complex mathematical formula. I reduce a lot the rendering time and, also, the rendering setup.
Yes, I have less tools, but for our office (arch-viz still images) Corona is production ready.
Well, which renderings time are you interested? I can post the version with no de-noise, in full resolution and the rendering time if you need.
IF you need honest and objective info about Corona vs VRay, tell me!