Hi Frank,
the sound is the same! I have about 120m of cat7 cable in the house for ML use (in addition to the 200m used for ethernet). I used std. RJ45 cat6 wall sockets with 2 connectors, one for ethernet (the right one) and one for ML (left one).
So I use ML cables, cut them in two halfs and fit an RJ45 connector at the open end. Only problem is that the wires of the B&O ML cable are too thick for the RJ45 connectors. So you have to use RJ45 connectors where the 8 wires are arranged in two rows. Then use a small drill to widen the holes - this job is a real pain in the a**. Order some spare connectors, you'll need them until get the hang of it!
But if all is finished, it is a reliable and easy to use system. Another advantage is that for the std ethernet sockets covers fitting the rest of the switches are available (I have Gira for example). Ah, and by the way all componets are pretty cheap!
Marcus