The D2000 doesn't get enough credit for how balanced they are. If I was going to choose a headphone for mixing it would be the D2000, D5000, D7000 or Audioquest Nighthawk.
The D2000 has potent sub bass, just shoots down like a rocket and meets the mids and stays flat. That upper mid notch is absolutely necessary as that's a difficult thing to get correct and especially on a flat headphone if that area was more elevated it would be pretty nasty on the ears. This is the reason that all headphones that measure like that will have that notch.
A lot of people call them bright but it's just the roughness in upper ranges that a lot of Biocellulose headphones have, the treble is quite flat. The 1540 measures ideal and the bass sounds exactly like the graphs IMO, soft, isn't potent and jaw rattling like the D2000, Nighthawk, LCD-2 etc it's closer to the HD650's bass without the impact. By the way, that peak just under 10k on the Shures gives them a grainy character and the only way around that is to pair them with an amp that elevates the mid bass.
No one does bass like a Biocell driver. The Fostex TH900 has
****in incredible bass and I joked about it in my review but it's an example of elevated bass with amazing control. If that headphone was more balanced it would be a D7000 killer.
The 650 still in a different league to all of them
and sounds like music, more surreal like you are lost in the music. The Little Dot MKIII I own is prob on par with the likes of the Vali 2, Bottle Head Crack without Speedball but with the right tubes just gives vocals this insane focus, I can taste the voices.