Oh damn, that looks bad. I'll check my copy of XF 16/1.4 when I get back home.
I've made a test shot against the sun to simulate similar conditions while the sun is still up, but I realised I have left my memory card reader at home.
Edit:
It's not perfect, but much better. And can be easily corrected in post (well, in ACR at least, because somehow purple defringing in Capture One doesn't work at all).