Designed for photo enthusiasts who want a pocketable, 'take everywhere' camera with a decent set of controls and capabilities, the lack of a viewfinder (or any way to attach one) will deter many potential purchasers. No matter how good LCD (and OLED) screens are, in bright sunlight, they force users into point-and-guess framing most of the time.
Still images from the G7X appeared very slightly soft straight out of the camera, although they sharpened up nicely with a little unsharp masking in Photoshop. Colours showed the usual slight increase in saturation we've come to expect from compact digicams.
http://photoreview.com.au/reviews/advanced-compact-cameras/fixed-lens/canon-powershot-g7x
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