Hmm.
In my "alpha" group, we're still playing out the epic arc of my 4e game, but there are three so far. (The group is 5 regular players + a couple irregular, once-in-a-while guys.) Nobody but me has a DMG or MM.
In my "beta" group, we're playing 5e. This group is weird- I run it at a friend's house, which doubles as a farm, and the group consists of whichever of his workers are around at the time. There are about 10 different players, but we've never had more than six at a time to the best of my recollection. The house has 3 PHs, and I have one, so that's four.
As for DMGs and MMs, I have one of each and the farm house has one of each, as well.