Confirming the experience reports posted here by many UHH members, the Sony a6400 got a top-rated review from this publication. As noted the auto-focus system is state-of-the-art superlative.
Now if someone will only make a reasonably priced, quality native e-mount super zoom. I would think by now there are enough e-mount cameras (FF and APS-C) in circulation to support such a product! Sigma, Tamron, Tokina, Samyang, anybody listening?