Yes, several times. I would rate LH higher, but I still like the MD-birds if I get a seat up front. Very quiet. Also, make sure sure you get either D or F-seat, since the A+C-seats don't have a blocked middle seat between them.
Regardsless of carrier, it is a short flight and nothing to write home about. If you fly SK, at least you can be sure of being able to use the Fast Track @CPH.