I have a 125mm Fuji 5.6 NW it's a great lens I like a lot, but I would class it as a ''general photography' lens so I wouldn't feel inclined to carry that and a 150mm, most of the time they are doing the same job. I guess it would make sense if you were an architectural photographer who frequently ran into limitations regarding where they could stand, and you could work out of your car. In the landscape you are just adding weight for marginal benefit. Most of the time you can move your camera position. I think if you own too many lenses in a sequence the temptation is to bring them with you 'just in case'. That is a better recipe for back pain than good images.