I personally think it's a bit early to be handing him the 'best ever' crown.
He's helped by playing in arguably the best ever club side and he hasn't quite done it at international level in the way you might expect. He's definitely the best player in the world right now, I think when the time comes to look at his career he'll rank alongside Pele and Maradona and arguably be better than either, but that's a debate to be had when his career has finished.