How good is the Sony 16mmF2.8 pancake lens?

I have seen quite a few deals that offer the Sony pancake 16mm lens free. I would like to know how good is the 16mm lens. I am looking to use it for indoor and general photography and particularly interested in it's small size.

If I use the kit lens mostly in it's near end, can I replace that by the pancake lens and enjoy more portability?

How good is the quality of images it renders as compared to the kit lens?