They sound more like the fidelio x1 with a smaller soundstage and more isolation. The l1 was one of the most uncomfortable cans I've owned because of both the small earcups and crazy clamping pressure. It seems those issues have returned. Thanks for the impressions! Now I'll look more into the k545 and HP50. I always though I had a small head and smaller ears but now that I know that the Momentum is way too small, the K550 fits on my head,and the a900x almost (lol, how could this fit anyone's head?!) fits on my head (and the 1r's pads are too thin), I can't take any chances. Thanks again.
Yeah, I'm also gonna look into the K545, which should be out here in the Netherlands any day now really. I also ordered the Focal Spirit Classic, which has just been released here, am curious how that will sound (but most of all, how comfortable they will be). Honestly, the Sony 1R is quite comfortable, but I don't think it sounds that great (quite veiled). But the Sony is the only closed (semi)portable headphone I've tried so far that actually has a decent earcup size.