My style of work asks for 24mm, 28mm,35mm and 50mm, with 50mm being maybe 10-15%. 16-35, 17, 40 I've never liked, I don't like zooms generally, since I never know what focal length I'm using, except at the extremes. I don't like 24-70, for the same reason and for carriyng some extra weight because of 70mm, which I never use. I also don't like the way this lens extrudes. The primes go on my nerves since I'm constantly changing lenses. This one is no-brainer for me. 24mm on one end, 35mm on the other. This is work of a genius! I'm surprised, shocked, happy!