After Hamilton clinched his second and third World Championship titles with Mercedes in 2014 and 2015, David Coulthard declared Hamilton the best driver of his generation, calling him "the Ayrton Senna of his era", an opinion which was more widely accepted amongst the public, experts, and fellow and former drivers. As Hamilton became more widely considered the best driver of his era, public and expert debate moved from his status in modern Formula One to his status amongst the greatest drivers in history. The next few seasons saw Hamilton eclipse a number of records, including achieving the most all-time pole positions ahead of Michael Schumacher, leading him to be regarded by some as the greatest qualifier in history. After winning his fourth and fifth world titles, Hamilton's place among the greats of the sport became firmly established in the opinions of experts, rivals and teammates alike, with some journalists and pundits considering the possibility of Hamilton being the greatest Formula One driver of all time.