Admittedly in a different league, but my Marantz CD5001OSE into my Denon AVR1707 sound infinitely better through analogue stereo cables than either coaxial or optical digital. The soundstage is far more natural sounding (as much as the receiver can manage, anyway), and detail is far better.
I use the FL and FR inputs of the 5.1 analogue input on the receiver in preference to the normal CD input, as this also offers massive improvements.
With the help of a mates Marantz PM4001 amp I did a like for like comparison last week, and found my receiver not too far behind. But only because of the connections choices I've made. If I'd compared CD input for CD input, the receiver would undoubtedly have been trounced.