Hi Groovy,
Maybe i would have less purchasing power than in Spain but i have to admit that with 60k EUR you live really really well in Spain.
I'm engineer and I'm the only one of all my friends earning that much much money. Even only my fix salary, 60k EUR, is in 80% of the cases double their salaries. I mean, Spain is a pain in the ass right now for finding a good job and my friends engineers only earn something around 28-33k EUR.
But they are happy. They will never be able to buy a house alone (in Spain it costs 3k-6kEUR each square meter) but they leave quite well.
The rest of my friends live with around 1k - 1.3k EUR net each month.

I feel confused about all the answers from you. It seems that most of you agree that 90k CHF is not too much for Switzerland. But my sister and my brother in law say that it's not that bad. Whenever my girlfriend would move and have another swiss salary, they say that we will live quite comfortable.
My brother in law started in this company with that salary and afterwards he reached 104k approx. And he is quite happy with his salary and his life. 14k CHf is not too much difference. Maybe with 90k i could have 5000CHF net each month in 13 payments and with 104k around 5600CHF.
I downloaded an excel file with fix expenses and keeping in mind a rent of around 1400CHF, my house in spain till i sell it, estimating the expenses of my future car, food(500CHF), etc, i could have left for not fix expenses something around 1200CHF.
Well, it's something.

I don't know, as i said before, i don't want to base my decission just in money. I think that the rest worths the movement and if i'm dissapointed i could always find a new job there.
The important thing is to move there and probably on the future it would be easier to find better things once you already live in Switzerland.

DC