I have seen no such comparisons!
Since you dropped my bomb prematurely, I'll go ahead and write my comparison here.
Listening through Yggy > audio-gd Master -1 preamp > Krell FPB 300cx.
Like the new headband design compared to HE-6, plus the thing is much much lighter. I like the size (L x W, diameter) of the cups but dislike the shallowness (ear touches the driver side) and the velour material (woolly and makes my ears itchy). I don't like the sleeving on the cable either, but I think most of us will be upgrading cables and probably hardwiring later.
At first listen, I think the differences between HE-6 and HE1k are obvious. HE1k is more detailed, faster, better layering, imaging, and soundstage. A better headphone, technically. BUT (here it comes) it's not engaging; it's laid-back - a bit boring. I've had to crank up the volume on the HE1k to get that engagement/raw energy of the HE-6. I'm so used to that level of excitement and magic, my ears kept digging for it then gave out in fatigue. There's a warmth to the HE1k bass that is bloomy and does not feel solid (like bass from SR-009). HE-6 forcefully thumps you in the chest while HE1k blows air in your face. If anyone heard the HE1k at CanJam, these sound VERY different from those. I'm inclined to say the pairs at CanJam were broken.
The whole time, I was longing to reach for the HE-6 because it's got the sound I know and love. I want that attack, visceralness, engagement in the mids that grabs you by the neck and doesn't let go. The HE1k is the better headphone no doubt, but it's not quite what I like. I think a lot of HE-6 owners will agree with me here. For all the other guys who didn't think the HE-6 was that special, this might be the perfect headphone.
Throughout all of yesterday, I was in a lot of disappointment and confusion. I finally got a headphone that's an upgrade after all these years of waiting, but I didn't like it. Something ticked in my mind and decided to do something about it. What if I put my Audeze Vegan pads on these. HOLY CRAP! THERE IT IS!!! The MAGIC is BACK baby! All the excitement, engagement, attack came back from a simple pad change! I love how they sound now. There is a minor annoyance in that theres a midbass boost which I'm currently still trying to fix, but it's a huge leap forward in the right direction. It finally sounds like a headphone with focus and man do those mids pop right out. I want to say the imaging and layer is better than the R10 now. The subbass is also earthshaking which I'm sure Abyss lover would like.
I would highly suggest that Fang should keep working on the pads. They are really holding the driver back.
At this point, I can almost say this is the best headphone in the world (haven't heard an Orpheus though). Hifiman did a very good job with the driver and now with my mod, I can say these are an HE-6 replacement. Last month, I shoved my modded HE-6 in Fang's face and told him these are the real benchmark! I sort of take that back now because the HE1k is the new benchmark once they have been modded.