The slumbering Nikon has awakened to the mirrorless present and future and has shown their cards in a very strong but not class-leading mirrorless product line. The Nikon Z7 & Z6 are nearly identical bodies with changes in the sensor and AF. The more expensive and higher resolution Z7 screams pixels with a 45.7MP Full Frame sensor ISO 64–25600 range which should be a direct replacement for D850 users. The other Z6 is a better low light camera geared more at wedding shooters and videographers at 24.5MP which should produce outstanding low light ISO 50–204800 with ISO expansion.
There is a lot to like in these cameras like a real 5 axis (5 Stop) IBIS stabilizer on the full frame sensor which also works on adapted lenses and works with Nikkor VR lenses from DSLR cameras to increase the 3 stops to a real 5 stops hybrid stabilization feature. The video modes offer 4k at 24, 25 and 30p which is so 2014 as is the 120fps full HD 1080p slow motion mode. AF also changes between models at 493 points on the Z7 and 273 on the Z6.