Everyone has their own priorities, of course, and often one may need to consider how a particular lens fits into a set of lenses for a given purpose. There is much in the small size, low weight, and OIS of the 18-55mm that I find appealing, but the angle of view of a 16mm lens is my 'bottom line': I'm unwilling to do without it. If I used the 18-55mm lens, I would have to lug around a second lens to cover 16mm, which sort of kills the size and weight advantage of the 18-55mm.