Not at all severe, luckily. The oak debris has already been cleared away. The tree company employees did more damage than the tree, stomping their way through flower beds to pick up small branches and breaking plants at ground level as they worked. Seven roses and a few hydrangeas will now have to grow back from their roots -- or not.
The redwood trunk will have to be lifted out of my back yard by a crane. I won't see the full extent of the damage until then. No homes, humans, or animals were hurt, however, and my neighbors' insurance companies will cover the cost, so no big whoop.