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rhino nurbs are, IMO, not supported in any program, as Nurbs; I mean, objects modelled in nurbs are converted in poly to be rendered; C4ds and Lightwave does'nt have any nurbs, although the word nurbs, or hyper nurbs, is sometimes used for subd-patches; but they are'nt nurbs, like in rhino, amapi pro, or Moi;
by the way, I 'm wrong: there is one program rendering nurbs as they are, without conversion, and it's realsoft... but I never try it, and don't know if it's native nurbs of the program, or imported ones...
in my opinion, using intensively rhino, carrara import the mesh with a fine smooth appearance, but you have to apply an extra smooth in lightwave; don't know, for C4d; (but, as I have Bodypaint in standalone, it is probably fine)..
Rhino 4 is going to be very interesting for users of zbrush, as some of the main commands are operating on heavy mesh like those produced in zbrush: trim, split, and booleans; also a lot of curves works on meshes, allowing to work simultoneously on mesh and nurbs;
finnally, via the SMURF plug in, it's relativeley easy to convert mesh in nurbs, wich is interestring once again for zbrush mesh, to work "further" wirth the easiness of nurbs..
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