Is the leica apo vario elmarit sl 90 280mm f 2 8 4 good for portraits?

Here is what the site says about that.

From Leica APO-Vario-Elmarit-SL 90-280mm f/2.8-4: Leica APO-Vario-Elmarit-SL 90-280mm f/2.8-4: A zoom lens by Leica for Full frame cameras, 90-280mm f/2.8-4. Specs - Maker: Leica - Focal length: 90-280mm (zoom) - Maximum aperture: f/2.8-4 (it gets darker as you zoom in) - Made for: Full frame sensors - Mounts: L-Mount - Stabilised: yes - Autofocus: yes What it frames like - On full frame (L-Mount): as marked, 90-280mm. - On APS-C (L-Mount): like 135-420mm on full frame; f/2.8-4 gives about ...

From Lenses: Your first lenses: 1. A standard zoom, 24-70mm or 24-105mm equivalent. The kit zoom is fine to start. 2. A fast standard prime, a 50mm f/1.8 on full frame or a 33-35mm f/1.4 to f/1.8 on APS-C. Low light, people, food. 3. Then add for what you shoot: a telephoto zoom for wildlife and sport (wildlife and sport), a wide zoom for landscapes (landscape), or an 85mm for portraits (portraits).

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