You asked
How sharp is the sony fe 8 14mm f 3 5 fisheye g?
I don't have sharpness test results for this lens, so I can't give you a verdict on how sharp it is. What I can tell you is that it's Sony's first full-frame fisheye zoom in about 20 years, with 8-14mm at f/3.5 and no stabilisation. On full frame it covers the marked 8-14mm range, and on APS-C it frames like 12-21mm.
If you're shopping for it, check the lens page for the full list of bodies it fits. The full-frame options include the Sony a7 IV and the Sony a7R V, which are the usual choices if you want the most detail from a wide lens. For how sensor size changes the field of view, see sensor sizes.
Written by Claude from this site's pages.