The Tokina Firin 20mm F2 FE AF is a great value and it can even top the more expensive Zeiss Loxia 21mm f/2.8 for most tasks. If Sony ever fully corrects their star eater issue, I will be adding this to my camera bag.
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mirrorlesscomparison – Tokina Firin 20mm f/2 vs Zeiss Loxia 21mm f/2.8 – The complete comparison
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Tokina FíRIN 20mm f/2.0 AF: B&H Photo / Amazon / Adorama
Zeiss Loxia 21mm: B&H Photo/Amazon/Adorama