Blender Build Bot master hash: 4ae6d58
I'm not able to export FBX file that can export sharp edges which will then import correctly in both Blender and Autodesk (Mudbox).
If I use while exporting Smoothing set to Off, FBX imports correctly to Blender but imports as fully smoothed in Autodesks software.
If I use Smoothing set to Edges it imports correctly to Autodesk but not to Blender.
Test file: