Is the canon rf 85mm f 1 2l usm ds sharp wide open?

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From Canon RF 85mm f/1.2L USM DS: Canon RF 85mm f/1.2L USM DS: A prime lens by Canon for Full frame cameras, 85mm f/1.2. The RF 85mm f/1.2L with a coating that smooths out-of-focus highlights, at the cost of some light. Specs - Maker: Canon - Focal length: 85mm (prime) - Maximum aperture: f/1.2 - Made for: Full frame sensors - Mounts: Canon RF - Stabilised: no - Autofocus: yes What it frames like - On full frame (Canon RF): as marked, 85mm. ...

From Lenses: Aperture: The f-number says how wide the lens opens. Smaller numbers let in more light: f/1.8 lets in about ten times as much light as f/5.6, more than three stops. A wide aperture means faster shutter speeds in dim light and more background blur. Zooms with a constant aperture, like a 24-70mm f/2.8, keep the same exposure throughout the zoom range; cheaper zooms get darker as you zoom in.

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