Olympus 150 400mm f 4 5 vs om system m zuiko 100 400mm f 5 6 3 is ii?

Here is what the site says about that.

From OM System M.Zuiko 100-400mm f/5-6.3 IS II: OM System M.Zuiko 100-400mm f/5-6.3 IS II: A zoom lens by OM System for Micro Four Thirds cameras, 100-400mm f/5-6.3. Specs - Maker: OM System - Focal length: 100-400mm (zoom) - Maximum aperture: f/5-6.3 (it gets darker as you zoom in) - Made for: Micro Four Thirds sensors - Mounts: Micro Four Thirds - Stabilised: yes - Autofocus: yes What it frames like - On Micro Four Thirds (Micro Four Thirds): like 200-800mm on full frame; f/5-6.3 ...

From OM System M.Zuiko 150-600mm f/5-6.3 IS: OM System M.Zuiko 150-600mm f/5-6.3 IS: A zoom lens by OM System for Micro Four Thirds cameras, 150-600mm f/5-6.3. 1200mm equivalent: the longest reach you can hand-hold.

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