Is the panasonic lumix g 42 5mm f 1 7 sharp wide open?

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From Panasonic Lumix G 42.5mm f/1.7: Panasonic Lumix G 42.5mm f/1.7: A prime lens by Panasonic for Micro Four Thirds cameras, 42mm f/1.7. Specs - Maker: Panasonic - Focal length: 42mm (prime) - Maximum aperture: f/1.7 - 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 85mm on full frame; f/1.7 gives about the depth of field of f/3.4 there. ...

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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