I'll have to see DeCode's paper and what the final numbers are after they've tested everyone. But based on wide-scale testing, it looks like between 20% and half of patients who test positive are asymptomatic. Unfortunately, that is high enough to be a threat (lots of hidden infections) but not so high as to be positive (lots of people who have silently gotten the virus and developed immunity).
Gotta, say SARS-CoV-2 is a real f---er of a virus.