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I think Sony has unlocked some new technique with optics that allows them to shrink their zooms.
This recent example wher their 70-350mm is physically shorter than Fujifilm's 70-300.
A few weeks ago we also found out their 24-70 F2,8 GM ii is smaller than everybody else's 24-70 F2,8.
And a few months ago we found out their infernally zoom 16-35 F4 is smaller than their previous external zoom 16-35 F4.
These 3 cases can't be a coincidence.