You're welcome Bedouin. Fuji paid for transport of the defective lens and for the new lens. I must add that the defective lens had been at the service centre two times without result except "lens tested and is within spec."
For your test I would use the smallest focus point. Do you have other lenses that you can do the same test with? That would rule-out a camera-based problem.
Maybe something is wrong with the alignment of the lens elements.
Since there is an area if sharpness it seems that the focus point was there. The blurrines might result from the alignment of the object. As I mentioned above, F1.2 gives you a very shallow field of death. Try F5.6 for a start. But maybe you’re right and the lens is defective.