The 009s run circles around the HEDD in detail retrieval, transient response, subtle timbral discrimination, and soundstage depth and transparency, and are at least their equal in dynamics (though maybe not slam). The 009s too have a bump in the 1-3K range but the effect is different - the Stax sound "sunny" (not bright exactly but not quite natural either); the HEDD sound bright and hard, pushing the sound out - the opposite of relaxed.
Thanks for the impression, much appreciated.
I think the culprit is probably the amp/dac.
I heard both (the sr-009s, Mk Omega2 and lamba 700 Mk2, with a 1000 - 3000 € energizer and the heddphone with low quality and enthusiast amp/dac) and I can say this choice of word " run circles around" is very obviously an extreme exaggeration.
The heddphone is slightly to noticeably better in dynamics than all planars I heard, even some of the dynamic driver headphones, but there is no headphone with more excellent dynamics than the SR-009S
Yes, compared to Stax, nothing sounds that relaxed (especially the lamba sr 700 mk2), but calling the headphone unrelaxed, is also an extreme exaggeration, since they are more relaxed than almost every headphone I listened to in this price range. They're just behind the stax lineup when it comes to the overall effortless presentation.
And being too hard and bright (upper midrange) is also quite exaggerated compared to all other headphones; the boost in this frequency range is only very little - little audible - only on tracks whic focus on this frequency range. The boost is so little, I positive most will not hear it. It is exactly the aspect what makes the heddphone's sound signature a very well mix between balanced and neutral/realistic and thus fun to listen to.
It is noticeably less hard/bright than an Utopa/Stellia.
I could also write something about the other things you mentioned, but I haven't listened to the audeze lcd 3F, so I'm not qualified
But I'm curios about your statement ".. they just sound more like the real thing."
I simply haven't heard a headphone, with a more natural/realistic timbre than the heddphone and more even tonality - so ....ehmm
So this statement "..
less timbrally realistic sound of the HEDDs has become hard to ignore." - no, just can't agree; a LCD headphone got a more realistic timbre than the heddphone is simply new to me.
There are some in the same ballpark, as the sennheiser hd 820, the Clear (even more than the Utopia) or the in some ways the stax.
Really not saying that you're lying, euphemize, badmouth things etc. but there is something off^^