In this week’s round-up of the global box-office scene:• Superb Korean debut promises more international growth for Mission: Impossible• Fox’s second John Green adaptation Paper Towns struggles to match The Fault in Our Stars• Ajay Devgn thriller Drishyam marks return to normality after mega-hits Baahubali and Bajrangi BhaijaanTom Cruise’s box-office purchase has actually been on the wane this decade, with diminished openings and final grosses for his run of work from 2010’s Knight and Day through Rock of Ages and Jack Reacher, to two fairly strong sci-fi films in the shape of Oblivion and Edge of Tomorrow.