I use both Sonar X2 and Studio One 2.5 and for someone just starting out, Sonar's learning curve and work flow IMHO is much more difficult than Studio One. IMHO Studio One sets the standard for work flow. True it's not loaded with features that some of the other DAW software have, but what it does have, it does very well and in an intuitive manner. And that's what makes it popular with songwriters, composers and so forth. People who want to get their ideas recorded with a minimum of fuss. Also going from tracking to mastered project can easily be done within Studio One.
Still, some people are going to prefer Sonar's workflow, Cubase, Samplitude or Logic. And there is no clear winner.
So the short answer is yes, they all have learning curves especially if you want to get deeper into the program.
I would suggest hitting Youtube for some videos and see what tickles your fancy :)
P.S. Just read your last post and Sonar Producer IMHO has some of the best and most useful included FX and so forth of all the DAW's I have used. Something to consider.