I tested 5G speeds on the new iPhone 12 Pro on VZW in the Washington, DC area. I found a spot with 5G UW (ultra-wideband) and another that just showed 5G. These were my results:

• 473 Mbps Up and 43.5 Mbps down (5G - UW)
• 221 Mbps Up and 41.7 Mbps down (5G)

The UW areas are small. The 5G areas are bigger in my area but also limited. These are impressive speeds. The promise of 5G is real in my opinion.