Hi mdesign,

re:
> I assumed that is same engine (algorithm). My bad. You are right. Importing it as Obj and manually
> subdivide it, is not same as import as subdivided obj.

They are totally different algorithms and engines. One of the main areas where they are different is in how extraordinary vertices are handled. In the older one (and in all other converters that I've tested myself) there are surface continuity breaks at extraordinary vertices. MoI's OBJ converter is able to handle those better and make totally smooth surfaces across extraordinary vertices. However it needs to use higher degree surfaces in those spots to do that, the higher degree surfaces will have denser control points but you can adjust that by the SubD import options > "Patch type" option to switch the priority from nicer topology to lower surface control point density.

- Michael