Vray for SU 2.0 and 3.4 comparative speed test?

[cuttingedge]

Hello guys, My Office management wants me to give justification to upgrade from vray 2.0 to vray 3.4.

Unfortunately, I have to pay the full-amount for the upgrade of 3 licenses. Im looking for a comparative benchmark test to give a report of say, 30% or 50% speed in rendering, etc.. The people up there are not technical and so they want numbers that proves it's worth the upgrade.

I saw a youtube video that claims 3.0 is 1.5 up to 5 times faster, but i thought this was not for sketchup but for 3dsmax.

I hope some folks out there can give me comparative data on their own tests.