Ahahah, it's true ! XD
But I think we could found some similarities also :

Joanna is a writer but Iris is a columnist.
Joanna and Iris like good wine.
Both has knowledges in history (but yes, Joanna know more than Iris in this area I think ! xD).
And they are intelligent women >w>

... I think Iris is so far of Lika's personality xD But maybe there still some commun points, who knows ?