"With Diego, I would go to the end of the world. But with Maradona, I wouldn't take a step." Diego. Maradona. There are no two names in world football that come with as much joy, as much anger, as much wonder and as much baggage. In fact, few names in world history could match them. And, as is made abundantly clear in Asif Kapadia's latest eponymous cinematic masterpiece, they were two very separate entities. If the use of both names in the title of the film doesn't tell you that - following on from the one-name explorations of Amy Winehouse (Oscar-winning) and Ayrton Senna - then the above quote from Diego's long-time personal trainer, Fernando Signorini, will.