There are other things in a6400 too....biggest positive is the elimination of 29 minutes in video!
another good thing is the adoption of HLG video, hdr video without the need of slog.
rack focus with fuji is problematic.... on most videos i saw, the transition is not as precise as with canon and sony (it passes the target and then goes back, like panasonic does)
It seems like it uses contrast detection instead of PDAF.