Hifiman HE400i costs 499$ and it's much better than DT880.
Much better? Subjective or objective? In any event how can we qualify that? I can't even begin to as I've yet to hear the HE400i, but I do take your point as the DT880 driver tech is really from over a decade ago, but then again driver technology doesn't really move that fast. So what constitutes "much better"? I'll try to give you a subjective example from my opinions of headphones that I have in my stable and have listened to extensively.
I can quite categorically say that the Beyerdynamic DT1770 pro is much better than the DT880, but I can also say that the DT880 is much better than the DT1770 pro. How's that then? How can two different headphones be better than each other. Well that depends.
The DT1770 pro is much better than the DT880 when I'm banging my head to Trance, DnB or Techno - it is, after all, what the DT1770 pro was designed for. Listening to the same music on the DT880 simply tears my ears out as the treble and upper mids are far to forward and the bass is recessed.
On the other hand the DT1770 pro fails at classical, acoustic and jazz as the bass is too forward and the mids are recessed making the tone unnatural, and this makes the DT880 a much better HP for these genres.
Another example which will hopefully bring this back on topic is the Beyerdynamic DT1350 vs the SINE. (I'll bet you're seeing a trend here
and I'll admit that I'm quite a Beyerdynamic fan)
The DT1350 is much better than the SINE, but also the SINE is much better than the DT1350. However this time it comes down to usage case as both headphones are actually quite tonally similar to my ears in that both have a great midrange and both are very musical.
The DT1350 is much better than the SINE when being used as a portable headphone. This is due to the DT1350s much better isolation (it's probably the best isolating on ear headphone in existence), and it's more forward bass, which, as you probably know, bass is the first frequency range to disappear when you're exposed to the ambient noise of an average city street, or public transport. In the same scenario the SINE pretty much loses everything it might have over the DT1350 and a lot more due to it's inferior isolation.
On the flip side the SINE is much better than the DT1350 when using it in a relatively quiet space such as an office or hotel room. The extra gob of bass that the DT1350 provides is not particularly welcome here as it makes the DT1350 sound a tad congested. In this scenario the finer points of the SINE come through with it's overall better detail and instrument separation.
So saying one headphone is much better than another is not really a clear cut thing, and to be able to ascertain it's "betterness" you need to put additional variables into the equation such as musical genre and usage case.
Anyway thanks for the tip on the HE400i - I'll certainly get a demo of them together with the Beyer T1 original (there I go again
) as both are now similarly priced where I am.