PHRubin wrote:
The a7iii is better in low light than the a6300.(https://www.bhphotovideo.com/c/compare/Sony_A6300_vs_Sony_A7_III/BHitems/1399788-REG_1394217-REG)
I'm only guessing, but since I'd use a 28mm on my film camera, the Sigma 30mm f/1.4 DC DN might be the one for you.
It is one of my top choices can't go wrong with that lens. Thanks Mr. Rubin