Now that the king of Sweden, Mans Zelmerlöw, has released his new album "Chameleon" and with Mengoni going 3xP and 4xP with his two album releases of 2015: Parole In Circolo and Le Cose Che Non Ho + his new live album which is slaying itunes at the moment...

are they two the most relevant former ESC finalists of the past 25 years?

It's still Loreen cause got decent success after her win. Zerlmerlöw has been a complete non-factor.

I doubt it, a lot of these artists are huge in their own country, like Anouk and Ilse here in the Netherlands. Also Italy had Emma and Il Volo who are still very relevant.