You asked

Is the sony fe 16mm f 1 8 g good for landscape?

Yes, I think it's a good landscape lens, with one caveat. At 16mm on full frame it gives you the wide sweep that landscapes need, and it's small enough to carry all day. It takes ordinary screw-in filters, so a polariser or a neutral density filter for long exposures is easy to add.

Landscape work is slow, and the landscape guide points you towards a tripod. That suits this lens, because it isn't stabilised. Most of your shots will be at f/8 to f/11 anyway, so the f/1.8 speed matters less here than it would for evening portraits.

For the body, I'd pair it with one of the Sony a7R V, Sony a7R IV or Sony a7R VI. The "R" bodies are the ones built for detail, and that's what landscapes reward. The full lens page is Sony FE 16mm f/1.8 G.

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