Thank you
Akira, I haven´t try side by side but I have work with the d750 for a long time and a lot of that in the 1600-3200 region. The Z6 looks cleaner already on the camera´s screen. On top of that I´m using nikon NX-D instead of my usual lightroom and I don´t know if that influences the final output. If this portrait is the reference then yes, it is noticeable better. The file is pliable and shows little to no noise even in the dark areas. Colors are spot on and clean too.
This is iso 3200. I´m very happy