Photons to Photos added the Sony a6400 to their database and not much has changed from the Sony a6300 or a6500, which both fall behind the Fujifilm X-T20 throughout much of the measured ISO range. Strangely the Sony a6400’s performance falls off past 6400 ISO in a way the other cameras do not. You can see and manipulate the results here.
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Sony a6400: B&H Photo / Amazon / Adorama
Sony a6500: B&H Photo / Amazon / Adorama
Sony a6300: B&H Photo / Amazon / Adorama
Fujifilm X-T20: B&H Photo / Amazon / Adorama