My dude, first of all, i'm sorry to hear about your friend. I hope that he and his wife recover.
Second though, the Spanish Influenza infected about a quarter of the world's population. The very highest estimate of the final death toll is 100 million, but most estimates put it between 17-50 million. So maximum 5%, but more like1-3% which is still pretty fucked, but not 25%.
Some studies show that the H1N1 pandemic of 2009 infected between 700 million to 1.4 billion, with a range of deaths between 151K and 575K, so we might have a ways to go yet.
Also we really need to hope that MERS doesn't mutate, that one is deadly as fuck (approx 36% of people diagnosed with it die from it). Right now, it's a low risk for human-to-human transmission.
We still don't know a lot about Covid-19, like what it's RO is, and what the percentage of case fatality rates is (I expect it to drop as more and more mild cases are reported). Finally, while the number of deaths from COVID-19 is scary (24,077), the number of cases recovered is good (122,672). So be cautious, take appropriate measures (wash hands, avoid large groups etc.) but take heed of Douglas Adams' advice: