Wide lens recommendations for BMPCC 6K

Hi there, I'm a recent BMPCC6K owner, with a history using Canon DLSR for video along with 7Artisans prime cine lenses for independent film/video art work.
I'm looking for a prime wide angle lens in the EF mount family - any prime 15 or 18mm recommendations for low-light shooting?
The rave reviews of the sigma art lens seem almost too good to be true, but maybe I'm just suspicious from only having shot on prime cine lenses thus far.

The Sigma 18-35mm is that good! It's only drawback is the weight.

Tokina ATX-i 11-20mm F2.8 Canon EF-S Mount

That’s a good lens too, but the Sigma is faster.

Laowa 12mm or the Tokina.