"Please, do elaborate! In detail, why is git better than subversion if all I need is a central repository for a few people working at a company on one site, sitting in the same room with permanent network access. No distributed or remote or on-the-go development, no forks"

You describe my environment almost exactly. I am pushing for a git migration mostly for the low-overhead branching/merging as I can have multiple discrete tasks on a given project which need to be rolled out individually.