Tom wants to know how much better 4K Blu-Ray is over standard blu-ray. Should he upgrade? Leo says that 4K is 4 times more resolution than standard Blu-ray, but the big difference is the higher dynamic range (HDR). The colors are bolder, the blacks are blacker, and viewers can see more detail in extreme brightness and low light. But everything in the chain has to support 4K. The TV, the cables, the player. But Leo believes we're finally at the end of the road for physical media. So if anyone wants to upgrade to 4K for one last copy, do it because they want the HDR upgrade. If that's not important, the standard blu-ray is fine.