Different; advantages to each. Your choice of 009 is excellent; they are the best headphones. I don't find as much satisfaction in many other top headphones, but the stax 007 and lambda pros are also excellent. Note that you'll be selling the 009 short by driving them with anything less than a maxed out KGSShv.
Lately I've been splitting time between my 2ch system and 009/007/KGSShv.
Lately I've been splitting time between my 2ch system and 009/007/KGSShv.