My observations with new/er vs. vintage as of last night's listening session. This was at lowish volume as my wife was asleep.
My newest acquisition is a set of Vienna Acoustics Mozarts, from 2005, the youngest speakers I own. They sound very good, and beautiful rosewood veneer cabs. Worth 2K+ when new, not to me. They have pretty good bass for twin 5 inch mid-woofer drivers and the highs are delicate and airy. Worth 2K+ when new, not to me. I also listened to my restored 1963 KLH Six's.
The Mozarts powered with 210wpc SS amp, the Six's powered with 35wpc tube amp.
At the same volume, playing the same song, the Six's bass was outstanding, the Mozarts couldn't come close. The highs went to the Mozarts with tone settings set flat. With the Six's, to equal the highs, I needed to add a little treble, not quite 2 o'clock position, to equal the Mozarts.
So my take away with this comparison was the newer technology drivers and crossovers and cab design vs. the vintage was not really better, and in this case, were not as good as the Six's.
Two years ago, I attended the NYC Audio show. There were amazing, very expensive systems being demoed. There were maybe 2 systems that blew me away, the rest, nice but nothing I would buy, even if I had the 40-60K to play with.
The next morning while it was all fresh in my mind, I went to the cave, and listened to my main system, listening the the ADS 910's, at equal volumes that I heard at the show. My vintage system sounded just as good and better than most of the gear I heard the day before. Again, vintage can sound just as good as modern gear from my experiences.