4K UHD outside broadcasts are no longer a rarity. Most of the major OB players are now capable of supplying a 4K OB production.
But while there are many 4K UHD capable OB units in operation in the UK and worldwide, few so far have been based on an IP infrastructure. 4K UHD trucks based on traditional SDI require a quad HD solution, which means a lot of extra cables compared to a standard HD truck and therefore a lot of extra weight and space headaches.