BTW, Rawa since you rendered it in both Corona and V-ray can we have some time coparsion? I belive it will be pretty informative since the result is obviously very similar and the scene is complex enough to get a decent test.
Not really much difference. Rendering speed is +/- about the same. V-Ray renders are noisier because V-Ray LensFX doesn't work with V-Ray denoiser, where as in Corona, everything works nicely together. So while rendertimes are similar, Corona images are denoised and V-Ray ones not.
Corona materials look a bit better due to the new glossy fresnel in Corona 1.5, which V-Ray should have in 3.5 version, so I can do better comparison once 3.5 is out.
Other than performance, generally, CoronaVFB is a lot more pleasurable to use and Corona postprocessing is superior to V-Ray's cumbersome old VFB. So if I had to pick a winner, it would definitely be Corona at this point. :)