I want your experience in choosing a new lens. 

I already have a couple of lenses with focal lengths as follows: 18-55mm, 70-300mm (MF), and 55-300mm (AF) - regardless the 18-55mm. All my zoom lenses are pretty good outdoors, so I intend to get the 18-140mm for indoors, although its focal length is already covered in my lens collection.

So here's my question. Is it worth getting a lens having a focal length that I have already have, or should I pick up a new lens that has a new focal length - like the 16-85mm?

You ask: "Why do I need another lens?". The zoom lenses I already have don't work well for shooting indoors. It keeps me very far from my subject, and in tight spaces I couldn't get nice shots. That's why I am thinking of a new lens.

I know that every lens has its own properties and features, but my question is from a `focal length` point of view. Theoretically, I own lenses that cover 18-300mm, but they don't quite suit my purposes.