+1 here I agree.
Yes I have paired them with the MA RX6, RX8 and MA Apex when testing them out. The pioneer handles the sound of MA beautifully. The APex sounded amazing and so did the RX6 and RX8. I just went with the CM series because I felt i liked the B&W sound more and I liked the look of the CM8.
The Pioneer has MCACC, which they use to automatically setup the speakers, it tests for distance between speakers, vibrations in the room, other sound interference and acoustics of the room itself. If your room is not idea it compensates by adding delays when the speakers fires at you. So if one front speaker is 3m away and the other is 3.5m it calibrates for you. Its done so well that it can calibrate any speaker you give it and get the best out of them.
This is the major advantage they have over the other AV systems. Of course you can adjust levels to your taste.
Bottom line, the MA and Pioneer is always a good pairing.