Had some spare time last friday and put together a small scene to test both V-Ray 3.0 and Corona.
The scene is no biggy, but I wanted to try a few things. For instance, I wanted to test the Material Converter with a couple donzen different materials. Found some discrepancies, some weirdness with anisotropy, but all fixable. The other thing I noticed was a small problem with the displacement: Corona seemed to simply ignore the mapping already applied to the object, which was kind of weird. On the bright side, I thought "what the heck" and replaced the displacement on the rug with real fur turned into geometry (21 million polys). Corona passed thru it like a breeze. So sweet!
Also did a few captures on different moments just to compare how noisy the pic is as time passes and found the scene to be completely noise-free after around 40 minutes (which is lightning fast compared to V-Ray, which took 2:30hrs to finish the same image).
Another thing: the same scene rendered MUCH slower when I had AO included as a render element. Anyone confirm that?