There’s a saying in the photography world: ‘Friends don’t let friends buy f/4 lenses’. It’s a half-truth. For most applications, a faster lens will always be the most usable option.
Most people buy the f/4 versions of a zoom, like a 24-70mm or 70-200mm for cost reasons and then ultimately sell it for the f/2.8 version. In the process you usually waste money. Hence telling your photographer friends to bite the bullet on the more expensive one.
