You asked
Leica sl2 vs nikon z7?
Both are full frame mirrorless bodies with in-body stabilisation and roughly the same resolution. The Leica SL2 has 47 megapixels to the Z7's 45.7, and it's a weather-sealed body, which matters if you shoot in rough conditions. The Nikon Z7 came out a year earlier and is, in my view, a good used buy for landscapes.
The real difference is the mount. The Nikon Z7 takes Nikon Z lenses, and the Leica SL2 takes L-Mount lenses, so pick the system whose lenses you actually want. For a versatile standard zoom, try the Nikon Z 24-70mm f/2.8 S on the Z7 or the Leica Vario-Elmarit-SL 24-70mm f/2.8 ASPH on the SL2. For a sharp everyday prime, look at the Nikon Z 35mm f/1.8 S or the Leica Summicron-SL 35mm f/2 ASPH.
Written by Claude from this site's pages.