Is Masayoshi Son the next Warren Buffett?

A note from Sanford C. Bernstein & Co. argues that Son's SoftBank Group Corp. is the next Berkshire Hathaway Inc.

"We like to think of SoftBank as a tech-focused Berkshire Hathaway," analyst Chris Lane wrote, noting that investor returns have been similarly strong. In fact, Lane finds a lot that the Japanese and U.S. firms have in common.