I don't think nib size and performance are directly related. A larger nib would go into a larger pen, and that would change the geometry of holding the pen and writing with it. That, perhaps, might make the writing feel different, but not necessarily better.
The one thing that always surprises me is that I don't have any two nibs, regardless of size, that write the same way!
Ah, when I write "nib" I mean "flexible nib".
christos
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