Is the voigtl nder portrait heliar 75mm f 1 8 sharp wide open?

Here is what the site says about that.

From Voigtländer Portrait Heliar 75mm f/1.8: Voigtländer Portrait Heliar 75mm f/1.8: A prime lens by Voigtländer for Full frame cameras, 75mm f/1.8. Specs - Maker: Voigtländer - Focal length: 75mm (prime) - Maximum aperture: f/1.8 - Made for: Full frame sensors - Mounts: Sony E, Nikon Z, Canon RF - Stabilised: no - Autofocus: no, manual focus What it frames like - On full frame (Sony E, Nikon Z, Canon RF): as marked, 75mm. - On APS-C (Sony E, Nikon Z): ...

From Voigtländer Super Wide-Heliar 15mm f/4.5 Aspherical III: Voigtländer Super Wide-Heliar 15mm f/4.5 Aspherical III: A prime lens by Voigtländer for Full frame cameras, 15mm f/4.5.

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