My go to 28mm E mount lens is the Sigma 28-45mm, although I'm also very fond of the Pentax 28mm f/3.5 K (for landscape shooting). I also really like the Loxia 25, which is sort of a longish 25. It's sort of replaced my Pentax 28mm as my prime, even though it's a tad wide.
And I'm going to buy the Voigtlander APO-Lanthar 28mm f/2 when the E mount version is released.
Historically when I've brought the lack of 28mm options, I was pointed to the FE 28mm f/2.
There are some 28mm options, mostly MF. There is the Viltrox 28mm f/1.8 for example, possibly a couple of more obscure ones.
