I'm wondering if I'll ever get to find out myself! Still no HP delivery which is becoming very frustrating. Amazon are usually outstanding but these are 'through' Amazon but coming from another company. They do have a very good rating so I think this may be a one-off hence giving them some leeway.
Anyway - the Philips L2 look fantastic and if I was in the market for a semi-open design in that price range they would certainly be high on my list. However, I'm specifically looking for a fairly good isolating HP as these will be my primary office cans. (I still love my Senn HD580 for those chances I get to listen alone in a quiet environment - an oldie but still a goodie :) )
gelocks - you mention songs with high levels of sibilance - any examples? This is an area in which the AKG K550 is often criticized and although I really like the overall sounds of them it is something I am hoping the Yams will be better at.
I'd love to pre-listen to some good examples so I can clearly hear the differences - any suggestions?