Assuming you don’t mean expensive trophy wines......
and you DO mean honest really good ones then I’d say
Mas La Plana
Toneles Valdespino (only had this once)
Tondonia, of course!
Tio Pepe should be the correct answer if ";icon wine"; means one which is very good and at the same time widely identified with Spain.
Tio Pepe absolutely ! and probably Noe as well.
As to Toneles....Paco never underestimate my reach !! ;-)
(the sad part is that I had only 10 mins to savour it. I am promised another chance and next time I’ll savour it all night long !)
I guess Mr. Sherry keeps a bottle or two waiting for you up in the hills of Granada.
Indeed Sñr Jerez has a hand in my Sherry education !