The veteran 16-35mm f2.8 and 24-70mm f2.8 lenses get modern coatings and other modern touches.

It’s hard to believe that they’re 10 years old, but Sony’s finally updating two of its most important lenses.

The Vario-Sonnar T* 16-35mm f2.8 SSM II and 24-70mm f2.8 II remain essentially the same but Sony incorporates more recent coatings — coating technology has change a lot in the last decade — for better clarity and less ghosting. Sony also claims significantly better subject tracking.
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https://www.cnet.com/news/sony-updates-staple-pro-a-mount-lenses/