Ch-risb The offer is only valid for new Disney+ subscribers. So you can only get the discounted price with your existing subscription once you have taken out a subscription with us.
As far as the price is concerned, it is the same for Sunrise and Disney+. Sunrise gives a CHF 5 discount and Disney+ only charges 10 months for a 12-month subscription. So both companies have an ongoing promotion.
Greetings
Daniele