Having seen the recent post from Andrew, I found this thread. Figured I’d add one data point.
Was at Chi Spacca in LA for a little celebration, and the table ordered the 2010 Bartolo Mascarello. The somm felt it was oxidized and brought a second bottle. They kindly let us taste both. I can’t say for certain that the source was the same. I recall them saying so but I am the only one who remembers that.
The first bottle did, indeed, give the impression that it was oxidized. I think you could have drank it and not known, just thought perhaps that it wasn’t as impressive as you would have liked. But next to the other bottle, it the difference was stark: the second bottle was totally fresh and delicious, bright and exciting with just a bit of development.
(Chi Spacca’s service was excellent.)