When prestige TV was first thought to be eclipsing movies, with quality scripts and meaty acting roles, two shows frequently bandied about were “Homeland” with Claire Danes and “The Americans” starring Matthew Rhys and Keri Russell. Danes acknowledges other parallels with Rhys. “I mean, you married an American lady, I married a British gentleman,” she said, referring to her marriage to Hugh Dancy and Rhys’ partner, Russell. “We’ve just been mirroring each other’s lives,”...