Nikon Z7 has a 46.0MP Full frame (35.9 x 23.9 mm ) sized BSI-CMOS sensor and features Expeed 6 processor. You can shoot at maximum resolution of 8256 x 5504 pixels with aspect ratios of 1:1, 5:4, 3:2 and 16:9. Z7 has a native ISO range of 64 - 25600 which can be boosted to 32 - 102400 and it can save files in RAW format which gives you a wider room for post processing.
Nikon Z7 is not the highest resolution Full frame camera. Blackmagic PYXIS 12K with its 98.8MP sensor is leading in this class. Check the comparison of Nikon Z7 vs Blackmagic PYXIS 12K or take a look at Highest resolution Mirrorless cameras list.
Nikon Z7 DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. Nikon Z7 sensor has been tested by DxO Mark and got an overall score of 99 for its image quality. You can find the details of their analysis of Nikon Z7 here.
Anti-Aliasing Filter
Another important feature about Nikon Z7's sensor is the lack of anti-alias (Low-pass) filter. Removing anti-aliasing filter increases the sharpness and level of detail but on the other side it also increases the chance of moiré occurring in certain scenes.
Let's look at how the size of the Nikon Z7's Full frame sensor compares with other standard sensor sizes.
Comparison image of Nikon Z7 Sensor Size with other standard sensors
Sensor size is what determines the circle of confusion, and therefore how much
depth of field Nikon Z7 gives you at any given aperture.
You can
calculate
the exact depth of field for the Nikon Z7
at any focal length, aperture and subject distance, including the hyperfocal distance
for landscapes and the very shallow focus zone you get with long telephoto lenses.