You asked
Sony fe 16 25mm f 2 8 g vs sigma 14 24mm f 2 8 dg dn art?
Both are f/2.8 zooms with autofocus and no stabilisation, but they cover different ranges. The Sigma 14-24mm f/2.8 DG DN Art starts at 14mm on full frame, which is the ultra-wide territory I'd want for big landscapes and interiors. It also comes in Sony E and L-Mount. The Sony FE 16-25mm f/2.8 G is Sony E only, and its narrower 16-25mm range is less dramatic on full frame. On APS-C it frames like 24-38mm, which is closer to a standard view.
If you want the widest look on a Sony E body, the Sigma is the pick. If you shoot APS-C and want something close to a standard zoom, the Sony makes more sense. For the reasoning behind wide zooms, see the landscape guide.
Written by Claude from this site's pages.