The world’s fastest and widest Full Frame lens in this category is the Sony 12-24mm f2.8 GM, but it comes with a worldie of a price tag.

The Sony 12-24mm f4 has been a staple in the camera bags of landscape shooters for a while, and so it should be: it’s a great lens. But there has been a clamoring for a faster G Master version. If you’re a photographer who has a need for speed, you’ll be pleased to know that your wait for a faster, ultra-wide-angle lens from Sony is over; the Sony 12-24mm f2.8 GM is finally here. It joins at a time when others such as Sigma and Tamron, have already released their fast ultra-wides. However, Sony has pushed the envelope with their offering.
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https://www.thephoblographer.com/2020/07/07/ultra-wide-ultra-sharp-and-ultra-pricey-sony-12-24mm-f2-8-gm-review/