Is the panasonic lumix s pro 70 200mm f 4 ois good for portraits?

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From Panasonic Lumix S Pro 70-200mm f/4 OIS: Panasonic Lumix S Pro 70-200mm f/4 OIS: A zoom lens by Panasonic for Full frame cameras, 70-200mm f/4. Specs - Maker: Panasonic - Focal length: 70-200mm (zoom) - Maximum aperture: f/4 - Made for: Full frame sensors - Mounts: L-Mount - Stabilised: yes - Autofocus: yes What it frames like - On full frame (L-Mount): as marked, 70-200mm. - On APS-C (L-Mount): like 105-300mm on full frame; f/4 gives about the depth of field of f/6 there. ...

From Panasonic Lumix S Pro 70-200mm f/2.8 OIS: Panasonic Lumix S Pro 70-200mm f/2.8 OIS: A zoom lens by Panasonic for Full frame cameras, 70-200mm f/2.8.

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