Hi, I have heard both speakers, but with different electronic, so I could escchar, the 380 m seemed better box, more refined, and more controlled, but it is also true that the 5.4 My friend does not have the right amp and the right room, the contour is more relaxed, acute is more like the C1, and the grave is more relaxed, but also very low ...
I describe the systems used.
System 1: Dynaudio 5.4, plinius odeon, audible illusions M3A preamp, eectrocompniet EMC1 up
System 2: Dynaudio focus 380, Threshold S/500, plinius Tautoro or Grypon Bel Canto preams, linn Majik DS
As I said before in these conditions but I liked the 380 .. I hope I helped a little. Greetings and good luck