Which camera brand is the world class?

Sony, canon, or nikon

Cannons are nice as well as Nikons

Sony is the one which will provide consistency in quality

The world class?

all of the brands you listed are sold around the world, if that is what you mean.

or if you want to ask what is the best, the answer to that would be Hasselblad

Canon > nikon

Hasselblad. But they're about 40 grand. There's Leica, Nikon, and Canon.

NIKON CANON