I have been playing alto for almost 5 years and about a month ago, I bought a curved soprano. I thought it would be easy sailing for me but to my surprise, I realized that playing soprano is much complicated than playing an alto sax. Even a slight movement of the mpc inside my mouth could alter the intonation and despite its size compared to my alto, I think I need more airstream to blow a tune.
There are times when I said to myself, why did I ever buy this sax when I am already doing fine in my alto but then I do know also that there are songs which could be better played in a soprano.