Sony is working on a new 16mm f/1.8 GM lens
Image on top shows the current two fast wide angle primes: 20mm f/1.8 G and 24mm f/1.4 GM (via CameraSize).
SonyAlphaRumors reports that Sony will announce a new 16mm f/1.8 GM lens in 2021. It would become the fastest 16mm FF on the market. Yet the Sigma 14mm f/1.8 FE still beats it in terms of wide focal lengths.
Astrophotographers will love that lens.