Is the 7artisans m 35mm f 1 7 seagull sharp wide open?

Here is what the site says about that.

From 7Artisans M 35mm f/1.7 Seagull: 7Artisans M 35mm f/1.7 Seagull: A prime lens by 7Artisans for Full frame cameras, 35mm f/1.7. Made with Seagull, in silver only. Specs - Maker: 7Artisans - Focal length: 35mm (prime) - Maximum aperture: f/1.7 - Made for: Full frame sensors - Mounts: Leica M - Stabilised: no - Autofocus: no, manual focus What it frames like - On full frame (Leica M): as marked, 35mm. Cameras it fits - Leica M9: Full frame - ...

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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