Fujifilm xf 400mm f 4 5 r lm ois wr vs fujifilm 500mm f 5 6?

Here is what the site says about that.

From Fujifilm XF 400mm f/4.5 R LM OIS WR: Fujifilm XF 400mm f/4.5 R LM OIS WR: A prime lens by Fujifilm for APS-C cameras, 400mm f/4.5. A super-telephoto prime, about 600mm equivalent, for wildlife and sport. Specs - Maker: Fujifilm - Focal length: 400mm (prime) - Maximum aperture: f/4.5 - Made for: APS-C sensors - Mounts: Fujifilm X - Stabilised: yes - Autofocus: yes What it frames like - On APS-C (Fujifilm X): like 600mm on full frame; f/4.5 gives about the depth of field of ...

From Fujifilm XF 500mm f/5.6 R LM OIS WR: Fujifilm XF 500mm f/5.6 R LM OIS WR: A prime lens by Fujifilm for APS-C cameras, 500mm f/5.6. A comparatively light super-telephoto prime, about 750mm equivalent.

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