|v-ray (Adaptive DMC) 9min 30sec|
|mental ray (Unified): 9min 31sec|
Based on similar times, you can see the disparity between the two. Trying to ignore the DOF and moBlur between the two and focusing on sampling, there is actually not that much difference. However I noticed that Vray seems or appears to have somewhat of a Gaussian blur look or filter to its sampling. While unified looks sharper, it also appears more noisy. I've noticed this is really evident in shadow samples from mrSkyPortals as an example. Perhaps there is a way to create a blurring of these samples at a 2D level without blurring the 3D image.
So there is no answer here, but more an open ended thought.
Until next time...happy rendering.
So as someone suggested, using Triangle or Mitchell filter really seems to fix the sampling. This example is using Triangle filter with the default 2,2. Oh, and by the way the render times were really good. The unified settings were min:1, max: 100, quality: 4.0, error threshold: 0.05. Also glossy, dof, and shadow samples were all set to 1. The results were actually quite good:
|mental ray unifiled (Triangle filter): 2min 11sec|