Sony releases a new firmware update for many FE lenses. It improves focusing performance in certain conditions. Here are the links to the firmware update download (Click on “Downloads” and select your OS):
35mm f/1.4 FE firmware download
35mm f/2.8 FE firmware download
70-200mm FE firmware download
24-70mm FE firmware download
55mm FE firmware download
28-70mm FE firmware download
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Thanks Dieter!