Now After connecting two systems I could compare with the above configuration. Sonically are worlds between the systems, Cambridge Audio's just HIFI for my ears and my mind.
The Sonos app is sending you better and easier to use than Cambridge Audio Stream Magic.
Button Line: The sound. Very good, especially for classical music and jazz, very clean and clear, powerful. From me: strong buy recommendation
Update: I added myself to connect my iPod's / iPad and iPhone 4 the Cambridge Audio ID-100 MKII and 13 connected to the digital input with the cables Oehlbach NF. Simply superb, the sound. Hear no difference to the CD. The ID 100 does not use the bad analog signal from Apple, such as the standard MP3 input the Minx XI, but pulls the digital signals and uses the built-in Minx XI 24-bit, 192 kHz Stereo DAC (Wolfson WM8728 DAC (digital to analog Converter) of the high-end class).