Unfortunate for you. Im glad it has a different curve from the rest. Why have all headphones that sound so similar to one another? At least the HE4 is different, and just as good. Just...different.
Think of it as a super DT880. People love the 880. They would love the HE-4. More body, less harshness... who can hate on that? The only problem is that its ridiculously hard to drive. Get a Lyr or SA-31, or some equivalent, and they shoul reward you handsomely.
Really I the only reason they got overlooked is because the HE500 came out soon after and stole the spotlight. However, they are known to be quite different. Then comes in the HE400 which is dark and musical and a lot easier to drive. The HE4 found itself in a bad place.
Still those of us that do like slight v shaped cans brighter sounding than the HE400 (bright in the way the DT880 is) though with similar treble to the he400 should have tried the HE4, assuming they have a beastly amp to drive them.