From what I've read from people that have listened to the universal models of both the JH5 and JH7; the JH7 is an improvement on every front from the JH5. Stronger lows, more pronounced mids, and clearer highs. The soundstage is likely improved as well.
Nothing by leaps and bounds, but it's noticeable.
Personally I'd like to see a few more JH7 owners around here, as I don't think we have nearly enough input about the mid level IEM's from manufacturers.
not pertinent to the original question, but what would compel you to buy a relatively obscure custom IEM (which are obscure items to begin with) when you dont understand basic acoustics? Never thought I'd get trolled on head-fi
Anyway, any real audiophiles want to weigh in on the original question?
"Not pertinent" refers to my comment about you. Sound doesn't bounce around your ear canals if your canals are sealed, and "breakfast dogs" is not a valid descriptor for midrange. If you walk up to a random guy off the street and ask them about ultimate ears or JH audio they wont know what you're talking about. please refrain from reviewing audio kit inebriated.