Most sensible Ultra Wide? Tamron 20mm f/2 8 Review

With it's affordable price, compact size and 1:2 macro, could the Tamron 20mm f/2.8 be the most sensible ultra wide angle lens for the Sony E shooters? What are the pros and cons?
My Tamron 24mm & 35mm f/2.8 (for Sony E) lens review: • Tamron 24mm & 35mm f/2...
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