OK. I have many lenses, like most other Pentax users- several limiteds, which are awesome, old Russian lenses, Cosinas, Rokinons, other Pentax primes and zooms (LBA ). But I see a niche for a walk-around lens that I don't need to take off the camera at whatever event or location I happen to be (e.g. what if it's dusty or wet?). Sure, I could choose a prime to walk around with, and I do that sometimes too, or for that mater multiple cameras, but luckily I'm not a pro who has to load up on gear, lol. I have for years been using a Tamron 17-50 2.8 as my fav walk-around lens, and it is a great lens for that. This lens, although slower, is superior to the Tamron in many ways. Way better close focus capabilities (0.26x), it's sharp wide open and overall better edge-to-edge than the Tamron. It is quiet and it's weather sealed, and resists CA better. And it has more reach at both ends. The build quality is very high. Hence, a highly useful lens for me, and I'll be selling the Tamron. Plus, it is on sale right now...Would you mind telling why you like it so much and how you are using it? I got one a while back thinking it would be on the camera most of the time but it rarely comes out of the bag.