You asked
Sony sonnar t fe 35mm f 2 8 za vs tamron 35mm f 2 8 di iii osd m1 2?
The two are close on paper. Both are 35mm f/2.8 autofocus primes for Sony E full frame, neither is stabilised, and both fit the same cameras, from the a7 up to the a7R VI, plus the APS-C bodies, where they frame like 52mm.
The main thing the site says about the Sony Sonnar T* FE 35mm f/2.8 ZA is that it's small and light, which matters if you'll carry it all day. I don't have enough on the Tamron 35mm f/2.8 Di III OSD M1:2 to say how it differs in handling or image quality, so I won't guess.
My pick: if size is your priority, go with the Sony. If you're comparing on price, check both before you buy. For a broader look at choosing a lens, see the landscape guide.
Written by Claude from this site's pages.