There have been some studies comparing Strads with modern vilins: https://www.livescience.com/44651-new-violins-beat-stradivarius.html https://www.livescience.c

There have been some studies comparing Strads with modern vilins: https://www.livescience.com/44651-new-violins-beat-stradivarius.html https://www.livescience.com/44651-new-violins-beat-stradivar..., not sure if there are any publicly available recordings.