1 - AntiAlias! AntiAlias! push that OSA button in the rendering tools, set the number beneath to 8 or higher, rerender.
2 - The crome 5 arm ‘svastica’ is too low poly, you can see plenty of edges here and there, which make the fake EnvMap looks ugly. SubSurf! SubSurf! (Beware, this will spoil points, you probably will need to remodel points.
3 - There is a refraction plugin somewhere. Look in the Q&A forum, look for my list of tut, look for valarking site, look for Al_capone site, look for IngeeBee site… look look…
Anyway blender is not that good for glass.
If your model is shiny metal and glass consider esporting it to a raytracer.