The only Tannoy in the prestige line that I have auditioned is the Turnberry SE. The sound character from this speaker somewhat similar to the Harbeth.
The sound is "SILKY" and a little darker compared to American and canadian made speakers that I owned and auditioned for so many years.
I did tried the Magico S5. I quite agree with Bhobba. The sound from S5 is a bit "Brittle". Detail and refine. And 1 word that that I think best describe the S5. It is Coherent.
I dont' know how the bigger brother of the Tannoy Prestige sound. I have yet to try. But I found the Turnberry is musical and pleasing to listen for long hours.
Should I buy Both :p ?