[Klaus]

Well, I can spot a dramatic difference in the 2nd image - the high skyscraper - the brighter side to the top.
The Fuji image is showing structures there, the Nikon isn't.

Generally, these two sample images aren't suitable for a comparison IMHO.

What dramatic difference do you see? Besides a warmer color cast on the Fuji (might have been the lighting at that time or simply the camera profile) I don't see anything noticeable.

Well. move the cursor to the top of the biggest skyscraper on the 2nd image.
You will notice that the window frames are visible in the Fuji image whereas in the Nikon variant it's all blurred.

The problem with these sample images is that they seem to be meant for comparing DR - but not resolution or if you prefer - micro-contrast. The difference between the two cameras should be more obvious with a forest or garden scene.

Of course, you can debate what "dramatic" means. Personally, I'm not hysterical about the difference in IQ between FF and MFT. It's always the question of whether you need that extra bit in quality (I don't).