Oldman received strong reviews and earned his first Academy Award nomination and a BAFTA Award nomination for his portrayal of British spy George Smiley in Tinker Tailor Soldier Spy (2011), an adaptation of the John le Carré novel, directed by Tomas Alfredson. To prepare for the role of George Smiley, Oldman gained 15 pounds, watched Alec Guinness' performance in Tinker Tailor Soldier Spy, and paid a visit to Smiley's creator John le Carré to perfect the character's voice. In 2012, Oldman played Floyd Banner, a big-hitting mobster, in John Hillcoat's Lawless, alongside Tom Hardy, Shia LaBeouf, Guy Pearce and Jessica Chastain. The following year, he portrayed Nicholas Wyatt, a ruthless CEO, in Robert Luketic's Paranoia, along with Harrison Ford and Liam Hemsworth. In 2014, Oldman starred alongside Joel Kinnaman, Abbie Cornish, Michael Keaton and Samuel L. Jackson in the remake of RoboCop, as Norton, the scientist who creates the title character.
Washington Post and Independent writers noted that Oldman is regarded as one of the greatest actors of his generation. In 2012, Globe and Mail journalist Lynn Crosbie wrote, "Critics never fail to single Oldman out... he is one of a few truly great living actors – arguably, even, the best." Of his diversity, Yahoo! Movies noted that he had "gained a well-earned reputation as a brilliant chameleon"; the Houston Chronicle dubbed Oldman "the face of versatility". He is noted for his avoidance of the Hollywood celebrity scene, often being referred to as an "actor's actor". His work has been acclaimed by Hollywood figures: Tom Hardy has described Oldman as his "absolute complete and utter hero" and "hands down, the greatest actor that's ever lived"; Brad Pitt, Daniel Radcliffe and Ryan Gosling have also cited Oldman as their favourite actor. Hardy recalled Oldman's influence on students at drama school, stating that "everybody used to quote him in all of his films". Jessica Chastain, Jennifer Lawrence, Joseph Gordon-Levitt, Tom Hiddleston and Chris Pine have also named Oldman as one of their favourite actors.
In 2012, Oldman was among the British cultural icons selected by artist Sir Peter Blake to appear in a new version of his most famous artwork – the Beatles' Sgt. Pepper's Lonely Hearts Club Band album cover – to celebrate the British cultural figures of his life that he most admires to mark his 80th birthday. In 2014, he received the Dilys Powell Award For Excellence In Film by the London Film Critics.