I still use two 24" 1920 x 1080 in my environment, primarily because my sight is not as good as what it once was. However several team members have upgraded their video equipment. One has a 55" 4K monitor, and one has a 40" 4K monitor. When they screen share, I take responsibility as the viewer to zoom in on my end, and pan around as needed to see specifically what they are looking at. Make your meeting attendees aware that they can do that and put the responsibility on them.
Bill Butler www.xcent.com