You asked

What are the alternatives to the sony fe 12 24mm f 2 8 gm?

I can't name a specific alternative yet. The catalogue entry for the Sony FE 12-24mm f/2.8 GM covers its specs and the Sony E cameras it fits, but it doesn't list other lenses to compare it with.

What I can offer is the general guidance. My landscape guide points to a wide zoom around 16-35mm on full frame as the classic choice for big skies and strong foregrounds. It also notes that f/4 zooms are lighter and cheaper than f/2.8 versions, and you'll rarely need the wider aperture for landscapes. If you want to know how a different focal length will frame on your camera, the focal length converter shows how crop factor changes the look.

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