The number I've seen is 30% and I've haven't seen anything written on the quality of life afterwards...
But either way, a 50% survival rate under circumstances where I am more likely to infect those I love the longer I'm alive makes it a much easier choice. At an R0 of 2, I'm statistically likely to take one other life, who will go on to take one other life etc. At an R0 of greater than 2, I'm going to result of many more people. Only at an R0 less than 2 is it even reasonable to consider trying your chances to stay alive.
But either way, a 50% survival rate under circumstances where I am more likely to infect those I love the longer I'm alive makes it a much easier choice. At an R0 of 2, I'm statistically likely to take one other life, who will go on to take one other life etc. At an R0 of greater than 2, I'm going to result of many more people. Only at an R0 less than 2 is it even reasonable to consider trying your chances to stay alive.