Softimage is an amazing software and many pro's love working with it.Some only work with Softimage
The basic principles are the same when you are working in any 3d application whether it's Softimage, Maya, 3DS, Lightwave, Rhino, Cinema4d, Modo or anything!
What matters is the output and nothing else!
I have seen plenty of guys using Blender and producing some insane stuff and that software is an open Source tool.
Know your tool and increase proficiency in anything you are working with.
Advise:- Don't be a fan boy to any specific application(be flexible)!