Like I said - lots of highly subjective opinions mostly based on one (or two) instruments from a certain (modern) maker compared with what can be enormously different initial quality products from old makers, and furthermore those instruments having been objects for various degrees of historic maltreatment,repitching and retuning by more or less dubious owners and craftsmen...what do you expect??...and what do you get out of it?? One special detail - are you aware that many of the old instruments that today are classified just by "Name so and so" initially may have covered price differences of 10 times !! Just have a look at Wheatstone pricelists from later part of 19th century.
What quality differences would you expect today between some product that costs £500 new and one that costs £5000? The market values today concerning old products however may have a span of 2 times for those initally differing by the said 10 times!