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...The Tokina Firin is more expensive, heavier, larger, doesn’t have weather sealing and is only f/2 compared to the f/1.8 of the Sony. The XD linear focus motors in the Sony lens, borrowed from previous G Master lenses, is also an incredible feature that lets you get the most out of Sony’s AF system...
the review Sony 20 mm f/1.8 G by Thomas from CameraLabs:
The Sony FE 20mm f1.8 G is an ultra-wide prime lens designed for Alpha mirrorless cameras and corrected for full-frame sensors. It delivers an ultra wide field-of-view that captures comfortably more than a 24mm, making it ideal for expansive landscapes, tight interiors, wide astro photography, as well as vlogging or environmental portraiture. It has a decent feature set including a de-clickable aperture ring and multi-purpose focus hold button plus its optical performance even surpasses the very good Sony FE 24mm f1.4 GM. This deserves a Highly Recommended!