Hi Kevin,
Thanks for the article; it is just what I wanted. Along with many others, I am looking at my full frame DLSR vs mirrorless. I have Fuji X kit and use as my walk round / travel kit now. I still use my full frame kit though for some situations, e.g. wildlife where fast focus, focus tracking and burst mode are important. Have you (or anyone else) tried this lens in such a situation, e.g. photographing diving gannets near a boat, and can show samples? Michael's lava images are getting there, but the subject is stationery, even if the photographer is not really!
Jonathan