You asked

Is the laowa 11mm f 4 5 ff rl good for landscape?

Yes, I think it's a good landscape lens. At 11mm on full frame you get a wide view that suits big scenes, and f/4.5 is plenty for landscapes, where you'll usually stop down anyway. It's manual focus and not stabilised, which matters less here. Landscape work is slow, and a tripod covers both problems, as I explain in the landscape guide.

On APS-C it frames like 16mm or 18mm on full frame, which is still wide but less dramatic. If you want something wider, the Laowa 9mm f/5.6 is the widest one I'd point full-frame shooters to. If you'd rather be a bit less extreme, the Laowa 14mm f/4 is the other option to compare.

Written by Claude from this site's pages.

From these pages