Michael,
As I know when MOI export .obj it export some kind of vertex normals I don't know what is it. This vertex normals shows in Cinema 4D as Normal Tag.
When I remove this normal Tag it looks like this:


When I Import it to 3d coat for sculpting it also look like this:


I know that when I import obj from moi in 3Ds Max it also looks like this.

I want to work in 3D coat but it looks agly, people from 3D coat forum telling that cause is software that made obj I think they are right. And I think those vetex normals is cause.
What do you think?