Yeah, I forgot to add info about the first render: I pressed RENDER in the morning and left home for the whole day. That's why render time is so long. I don't know how much time it would take to render this image noiseless but as you can see after 30 minutes of rendering it wasn't THAT noisy, which is good for a rendering with DOF, glossy reflections and no lights (only env light and windows). I think in such scenes on my low-end laptop Corona is about 4 times faster than v-ray. In v-ray I would probably have to leave my pc on for these 8 hours to maintain such result. :)
