400 is surprisingly little reach on a full frame camera. It might not be the end of your lens quest. So many lenses, so little funds....Thank you so much for all your replies. I find always helpful reading other people views because it can help us seeing things differently.
Today é went shooting the sunrise, and while at the hill, looking downwards to the sea shore, I saw some rock layering that I wanted to get, but I was maxed out at 70mm on my 24-70 and thinking... man... I WANT, I NEED that 100-400!
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I decided to hold on the printer purchase and stick with my initial plan, by the lens.
I will take your advice though and will invest first on a new monitor and calibrator. Black Friday is near so I will look what offers I can get from BenQ.
Not sure on the 4K screen though. Never understood the concept of buying a 4K screen and then having to change Windows scale to be able to read the text due to its size. By resizing the screen, one literally loses the desktop space that a 4K screen offers when compared with a 1080P resolution. Spend $1000 on a 4K screen to then having it running at 1080 so we can read what is on the screen, seems a bad investment.
Apparently, it seems the 100-400 Z lens release might be closer than I thought since it has been "featured" (?) in Nikon's second Z9 teaser (according to Ricci).