Board Thread:Theories and Speculation/@comment-36512555-20190422151037/@comment-9782468-20190423182955

Kyle Ethan wrote: The Sharingan can barely counter the Hidden Mist Jutsu... I don't think Itachi will through ordinary methods. The Sharingan can't see past chakra-based obstructions. Since the mist was chakra-based, it negated the Sharingan's abilities because the Sharingan only granted you clarity on what you can see.

Also, Kakashi, while an expert Sharingan user, is not the master that Itachi is with the Sharingan. At least not at the time he fought Zabuza