Actually, i take that "The sound isn't the most open" comment back. i've been spending the last hour with the big four, c-jays, hd238, hfi-15g and k450.
been playing a lot of 80's music, eye of thge tigar - survivour, tell it to my heart - Taylor Dayne, we close our eyes - go west. I deduce the follow.
Ultrasone hfi-15g
probably the most grounded of the four, and the most balanced, although they could do with better seperation.
Sennheiser HD238
in this company, they lean more towards the Ultrasones, in their presentation. slighly subdued mdirange, not as well balanced as the Ultrasone's, but better top end. They sound very crisp, but somehow, not as invovling as the Ultrsone's.
c-jays
bags of midrange punch. very forward in their presentaion. maybe that's why i say the ultrasone's need an amp, becasue in comparison, the c-jays are very ...loud. could do with a touch more at the top end, but sepereation in the mids and definition in the lower mids are brilliant.
AKG K450
in terms of having a forward presentation, think c-jays X2. these are loud, up front and very 'in ya face' like nothing else. very heavy in the mid and low end, with a slightly crisper top end than the c-jays. however the forward nature of the sound, might not suit all. but they are fantastic.
quick conclusion.
Ultrasone's: most grounded and balanced
Sennheiser: Crisp and forward. if you're a grado fan and you want a pair of portables, these will do
c-jays: near perfect minimalist design that works well. performance belies the dimensions. if you're coming from Shure's these are the ones to have.
AKG: if you want fullsize Ultrasone, Beyer AKG sound, in a portable, then these are for you. They can cut it against the competition, make no mistake.
P.S.
sorry for the lack of pictures, i'm hoping to put some on soon. Sorry also that i haven't compared them against more headphones.... icans, grado sr60 etc. to cut a long story sort, my wife and i have split up, but i'm currently looking after her in her house because shs not too well, and so i haven't got all my gear with me.