It's not really a portraiture focal length, though you still can acheive some blur background. prime (fixed focal length) lenses are hardly all purposes really, the 12-32 kit lens would fit most purposes. But if you can adapt to certain to it's focal lengths only, it can become all purposes. For example, you can try to zoom your 12-32 to 20mm and walk around and see if you can use at that focal length only.