I must say I am surprised about how much I have used the 24-120 f4. I bought it purely because it was a huge bargain as part of a bundle.
It has become my go-to lens for 4x4 events and also for family events, something I seem to have done quite a lot of last year. However, it may be worth noting that about 500 of those are in the focal range it shares with the 15-30mm f2.8, which would arguably have delivered better results.
On the other hand, I find the 15-30 a dangerous lens to use for 4x4 events. On the occasions I have used it for that, I have nearly been run over a couple of times, as I just don't realize how close the cars get.