That is what the USA Today publication is claiming:

Korean beef, not Japan’s wagyu, “might be the best meat on earth,” according to an article in USA Today last week that seems to reflect fresh global recognition.

“Wagyu from Japan is often held up as the best beef in the world,” says an article by Bloomberg’s published in March last year. But the headline asked “Is Wagyu the World’s Most Overrated Steak?”

Wagyu is loved for its tenderness, but some complain that it is too soft and buttery and does not have enough flavor. On the other hand Korean beef, or hanwoo, is said to have great flavor as well as texture to the palate. They are both highly marbled but are distinctively different in taste.

The key to the difference in taste is the fat-to-protein ratio. Wagyu ribeye is about 70 percent fat and 30 percent protein, whereas hanwoo ribeye has 40 to 50 percent fat. It strikes a fine balance between the strengths of wagyu and less fatty and tougher American or Australian beef.  [Chosun Ilbo]

You can read more at the link or the original USA Today article at this link.