You asked
Is the canon ef 11 24mm f 4l usm good for landscape?
Yes, it's a good fit for landscapes. At 11-24mm on full frame, it's in the wide-zoom range the landscape guide calls the classic choice for big skies and strong foregrounds. Its f/4 aperture suits the f/8 to f/11 shooting most landscapes need, and it's lighter and cheaper than the f/2.8 zooms.
Because it isn't stabilised, a tripod helps, and the landscape page notes that tripods are normal there. For a full-frame body, I'd look at the Canon EOS 5D Mark IV, the Canon EOS 6D Mark II, or the Canon EOS 5DS R. The lens page has the full list of compatible cameras.
Written by Claude from this site's pages.