yes, he is. But not because of this world cup. The only thing world class he has shown at this world class he has shown at this world cup is that he is a world class penality taker - which is still great - 4/4 on the biggest stage, is very impressive.
Apart from that he has 2 goals an done lucky deflection, which doesn't quite put him up there with the best of the best.
But he is world class in general. You just have to look at his record for the past 3-4 seasons and its obvious. I was very skeptical of him when he first started.. but then he just kept on going.. one season.. two seasons.. three seasons.. the CL.. now at international level. He is not pretty or glamorous, but if you look at his results, and then compare him to other strikers, he is up there with the best of the best in the world, and that makes him - world class.
And all while playing for spurs, rather then a Barcelona, or Madrid.