Open simple file that has autosmooth and a few edges marked as Sharp (Ctrl+E > Sharp):
Now compare Eevee and the Blender Internal views (in 2.8 or 2.78).
One of the triangles of the sphere is supposed to be "split". It works fine in 2.78 and BI. But it is totally smooth in Eevee/Clay.
(to really see this in Clay you may want to reduce edge and concavity influences to 0.0.