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OP again. I just ordered the 20mm. Some r/GH5 user who makes corporate videos owns the glass and told me that it's virtually silent and has little to no focus breathing when video autofocusing, so perfect for my purposes and it's a very good price. I hope I enjoy the 20mm (40mm equivalent) as I do with my other primes (25 and 42.5 and 50).
Sage because the thread became shit. Take care!