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Hi, I didn't have a ruler with me, but the HE1000k has a oblong upside-down teardrop-shaped earcup, so mainly the height of the earcups are different. For me (I have a small head - HE400 on smallest headband setting, HE-560 on 2nd smallest headband setting), they basically covered the majority of the side of my head. The depth of the earcup is very similar (so they do not protrude out from your head more than the HE-560).
The HE1000 are extremely linear, so the mids were definitely not deficient & these headphones do NOT have a u-shaped sound signature from my listening tests. For me personally, sometimes I find a neutral pair of headphones a bit on the boring side, but for these HE1000s, they sounded so life-like and engaging, you really don't feel like you are listening to music, but rather listening to instruments that are in the room with you.
I have actually never heard the HE-500 or HE-6. I do have a HE-560. The sound of the HE1000 is a definite step-up from that imo (though I was not able to direct compare). Hard for me to describe the mids in any more detail with a direct reference/comparison point. I did was not really able to identify any real weaknesses in the sound signature during my short time with them.