Sennheiser HD 800 S is $1700 and has been around for years. Or the Meze Elite Tungsten at $4,000 - if Apple can get 80/90% of the way there at $549, they'd be a steal for the right customer.
The quality x price curve is not linear. Expensive materials and engineering often produce only incremental quality improvements, if any. Sometimes the improvements are only cosmetic. So Apple's headphones would need to be a lot closer to the best of the best than 80-90% in order to justify their price.
Just buy the good ol' HD-600, or some sealed cans, or whatever fits your head the best and use an eq profile from AutoEq.