The fox was configured to the F20 class rules in Europe. The I-20 has an oversized sail plan (it does not fit the F20 rule). The two boats were never on the same playing field.
They did compete alongside each other - under iF20 rules in Europe. The Fox was good in the right conditions but it still struggled against the i20s as a whole.
I think that the fox suffered the same fate as iF20 - lack of support from manufacturers.
