The announcement of the A6100 and A6600 completes the new trio of Sony APS-C E-mount cameras, replacing the A6000, A6300 and A6500 triplets.

Now “replace” might not be the exact term we’re looking for. Knowing Sony, they will likely keep the older models on the market so as to capture some extra sales by knocking the prices down.
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https://mirrorlesscomparison.com/preview/sony-a6100-vs-a6400-vs-a6600/