My Nikon experience is limited to 20mm, 28mm, 35mm and up. I've found the 20 very useful for special situations but too wide for general use, and the 28 not wide enough for many general applications.
Compare to my RF kit which has (or has had) 15mm, 21mm, 25mm, 28mm, 35mm, 40mm, 50mm, 75mm and 90mm.
I've kept the 15, even though rarely used, because it is a specialist lens with useful characteristics.
I then decided to keep the 28 as it is the widest frameline on my M6 and is a generally pretty useful lens. I sold (and may yet regret it) the 25. It was f4 maximum aperture whereas the 28 is f2 but it was also a lens I used a lot for travel. But I also felt that 25 and 28 were too close together,but that 25 and 35 were too far apart.
So I decided on the 21 and the 28.
I sold the 40 as I felt that with good 35 and 50mm lenses the 40 fell in the middle and the 35 is just as small, just as fast and just as useful as the 40. (Plus my M6 and R4A don't have 40 framelines).
If I had to make a choice from scratch now I'd pick the 35/1.4 as my most used lens and I'd try to get a 24/25 fast prime - need something faster than the f4 of the CV lens though.