Review of the Nikon NIKKOR Z 20/1.8 S Lens (20mm f/1.8).
This lens is 2 years old and made in China. It features three ED elements and three aspherical elements. It has a stepper autofocus motor which is silent for video usage. This is an S line lens which means it gets Nikon's weather sealing to protect it against the elements. It's a modern lens design made for today's high resolution sensors. It is expensive at $1050 USD (2020). This lens was introduced when 45MP cameras were modern.
This lens is great for pet portraiture.
This is the best 20mm lens Nikon have ever made.
There is no color fringing. There is vignetting wide open, which is nearly cut in half by f/2.8-f/4. Barrel distortion is high and should be corrected in post if photographing distortion sensitive objects like those commonly found in architecture photography.
In the above two images notice that the vertical reflective pattern is picked up by the lens. This lens has incredible resolving power in the corners which is atypical for an ultra wide angle lens. The lens is sharp with good contrast across the frame.