I understand most people think Linux is being used in most studio pipelines, but most studios are using the following software, under commercially available licensing.  If you notice, only the lesser used 3D software is natively supporting Linux.  The major players do not  This doesn't mean they can't be run virtually, but there's no native versions..

Maya - No native linux support.

3dsmax - No native linux or mac support.

Cinema4D - No native linux support, but I know they have a highly customized, elite version available for only the largest studios.  90% of studios would not be using this in their pipelines, and it's not available for commercial use.

Softimage XSI - YES, but this software is being discontinued after 2015, and will no longer be updated by Autodesk.

Lightwave3D - Looks like only Win and Mac native support, although I have seen it bing run on Linux, virtually.  Lightwave3D System Requirements.

MODO - Yes.  One of the few big guns that openly supports Linux OS natively.

Houdini - YES.  This one is being used by the largest CGI/FX houses on dedicated Linux workstations.

I'm sure there's many more 3D software out there that run natively on Linux, but those apps above are the ones that every major and medium size studio are running on their workstations.  Mind you, I'm not referring to render farms.