Using the ultrawide 9mm Viltrox on the Z fc is enjoyable.Its handling of colours is superb due to the virtually non-existing CA issues.
It aptly demonstrates what I call "wide angle paradox" of showing how depth of field is limited despite the very short focal length. This is evident because the lens itself is so sharp. One sees this clearly when the lens is focused very close. Even at f/8, I could not get the wall behind these Parthenocissus vines in sharp focus, because the front subject was so close (approx. 20 cm). The area coverage is there, though.