Not 3dcoat related but still on topic IMO.
:exports from rhino. obj, without chamfer and in Mudbox refine surface with subdivide selection:



also Tom Finnigan (tsplines founder) said
(I'm working on a T-Spline to SubD converter, which should work great with mudbox. It's still in an early state, but should be helpful.

I'm currently working on improving performance in 2.1, but I think I should be able to get it into 2.1 as well.

In the meantime, Juan's suggestion will work pretty well.)

http://www.tsplines.com/forum/viewtopic.php?f=9&t=29265

As 3d Coat import OBJ absolutly no problem to import OBJ object (ngones) from Moi and tranform it in Voxels for crazzy images!
(here "voxels" (not polygons) Conceptual image of course :)