What are the alternatives to the panasonic lumix s pro 16 35mm f 4?

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From Panasonic Lumix S Pro 16-35mm f/4: Panasonic Lumix S Pro 16-35mm f/4: A zoom lens by Panasonic for Full frame cameras, 16-35mm f/4. Specs - Maker: Panasonic - Focal length: 16-35mm (zoom) - Maximum aperture: f/4 - Made for: Full frame sensors - Mounts: L-Mount - Stabilised: no - Autofocus: yes What it frames like - On full frame (L-Mount): as marked, 16-35mm. - On APS-C (L-Mount): like 24-52mm on full frame; f/4 gives about the depth of field of f/6 there. ...

From Panasonic Lumix S Pro 50mm f/1.4: Panasonic Lumix S Pro 50mm f/1.4: A prime lens by Panasonic for Full frame cameras, 50mm f/1.4.

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