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With the Sony mirrorless cameras, the native/base ISO when shooting S-Log2/3 has always been the lowest number you're able to use (at least that's what's been recommended by many).
But I doubt you'll see a major difference between 800 and 1600 if you need to use the latter.
Google "Native ISO 800 A6500" or another combination of words and you should find more information.
3200 was on the original a7S (if I remember correctly).
You can use an ISO below 800 in video mode on the A6500, but in other picture profiles (not LOG).