Panasonic has finally revealed full details of its Leica DG Vario-Summilux 10-25mm f/1.7 ASPH. lens.

The optic, which is said to be the world’s fastest constant-aperture f/1.7 wide-angle zoom, is compatible with the company’s G-series cameras like the G9, in addition to other Micro Four Thirds models, rather than its new full-frame S1and S1R bodies.
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https://www.techradar.com/news/panasonic-makes-the-leica-dg-vario-summilux-10-25mm-f17-asph-official