Xara 365-vector brush confusion.

[iamtheblues]

As I understood it, in this thread Xara's line brushes are now vector.
Using XP&GD12, I produced this simple crude drawing that looks great when zoomed in in Xara.
However, upon exporting as .svg and also .ai the results are disappointing in Inkscape and Illustrator.
The resulting .svg looks awful in Inkscape as expected.
As you can see from the screen grab -eyes in illustrator- it does indeed import vector files with editable paths, but the eye portion has changed markedly.
I suppose the reason for this could be that I used a circle using the Ellipse Tool and didn't convert to editable shapes before exporting.
The eyebrow looks perfect when zoomed in using Illustrator, so I imagine this is the probable explanation.
Can anyone confirm that Ellipses and other shapes should be converted prior to export?
Bob