You asked
What are the alternatives to the sony e pz 10 20mm f 4 g?
I don't have a list of other lenses to suggest against the Sony E PZ 10-20mm f/4 G. Its page covers the lens itself and the Sony E cameras it fits, but it doesn't name rival models, so I won't guess at any.
What I can offer is the reasoning. This is a wide zoom for APS-C, and the Landscape guide explains why that focal range is the classic choice for big skies and strong foregrounds. It also makes the case for f/4 zooms: they're lighter and cheaper than f/2.8 versions, and landscape work rarely needs a fast aperture.
If you tell me what you want to shoot, I can point you to the right guide. For the full lens-by-lens picture, start with the Sony E mount page, which lists the lenses that fit that system.
Written by Claude from this site's pages.