A new XZ-2 review by digitalcamerainfo.com

Regarding IQ they conclude:

But the goalposts have moved since the XZ-1 hit the market back in early 2011. With the arrival of larger-sensor compacts and improved performance from other 1/1.7"-equipped models, the XZ-2 needed to step up its image quality game to stay relevant. Unfortunately, that hasn’t happened. The new edition’s image quality is certainly good—far better than the majority of compacts, and really very nice in good light—but it needed to be great in all conditions in order to keep up. Even with good sharpness and one of the brightest lenses out there, high noise levels, too-aggressive noise reduction, disappointing distortion, and poor low-light sensitivity all take a toll when comparing the XZ-2 to titans like the Sony RX100 and new Canon G15.

Disappointing !