Nikon does not have 24-120 (or anything close really). They have 24-70F4 ... which is just ... no. Cute kit, not much of a travelzoom. That mythical 24-120 is planned for 2021 and it will cost north of $1000. Thats bloody expensive. And it will be massive. That nikon 24-70 is heavier and bigger than the fuji 16-80.
Canon also does not have 24-120, they DO have 24-105F4 though. Its, again, more that $1000. Its also massive, it weights 700g, which is nearly twice the fuji.
It really does not matter how sharp a lens is when you cant afford it. And if you can, then it again does not matter how sharp it is when its so heavy you will not take it with you.
Just face the facts. FF cant really beat APS-C in the travelzoom category. Just stop spewing bullshit about stuff you obviously know nothing about.
That fuji 16-80F4 is perfectly fine lens for a travelzoom. It has good center sharpenss. Its not THAT expensive. And its a nice lens to use. Definitely more so that the 18-135, which has an atrocious zoom ring. And 18mm on aps-c is a bit too narrow for some shots.