Affordable (sub-$1k), fast (f/2 or faster), wide-angle (20-30mm) prime?

I think for under 1k, you pretty much listed all your options.

Sigma does have the older series 20,24,28 all 1.8, that's probably the rest.

I had the 20mm for a while on FF, wasn't super happy, probably better on crop. Had the 28mm 1.8 on a 4/3 mount (olympus 2x crop), and it was optically great.

The 20/24/28 sigma all have very slow AF, and have a goofy build, but the 24 and 28 are optically very good.

I love the Sigma 30mm, its in a different league, but many people seem leery of it being non-canon or quality control, which I understand.

So that leaves ....

The 28mm 1.8, which I personally just dont love.

That's my 2 cents