The only reasons i bought vintage is i am old, i owned the Tannot dual concentric till few years ago , i bought them 55 years ago...
The other reason i bought a vintage Sansui alpha from 35 years ago is for the price, to beat it will cost a lot... it was the TOP of Sansui design.... ( most alpha models were never exported)
the last reason i bought a vintage heaphone is also price but his design is unique and it certainly qualify to be in the TOP headphones even today...
Vintage ask for refurbishing if we are lucky and more if not...
Nowadays there is gear very good at all price scale even almost at cost of peanuts...it is all related to our needs and our budget...
Anyway my vintage AKG K340 cannot be replaced by any headphone i ever heard which all sound as trash compared...
And the Sansui i failed to upgrade it. when i bought 1 year ago one of the best tube headphone amplifier on the market to serve my King K340... failure and no comparison at all ... No synergy and unable to drive them at their holographic peak level... I returned it losing few hundred bucks for assurance and postal fees and other fees...
I will stay vintage with my Sansui & my vintage headphone... By obligation...To have the same quality of my 400 bucks headphone vintage/amp it will cost me 10,000 bucks to rival it... And i am not sure because the K340 acoustic hybrid design is unique...