it was said that "Sharigan" can c through bunshins and illusionaries with no problem.
because it see it as a chakara source. but is kage bunshin really a chakara souce or a real body??
i remember the neji vs naruto battle where neji also saw naruto clones as chakara sources, but he couldn't tell which one is the real one because naruto put = amout of chakara for each clone.


when i watched naruto( manga and anime), i never saw sharigan actually c threw a kage bunshin.

1. During the Kakashi vs Zabuka fight the part where Zabuka made a Bunshin and tricked Kakashi(sharigan user), Tricked him into the waterball barriar jutsu (forgot the real name) and that time kakashi didn't c through the real one too.
2. Naruto vs Sasuke battle, the last battle were they face in the anime(at the valley or end, forgot actual name.) when naruto made a bunch of kage bunshins, Sasuke also failed to c threw the real one. all he did was use the fire jutsu(which waste more chakara) instead of looking for the real naruto and attack directly.

so my theory is that sharigan probably can c threw a regular bunshin no jutsu because regular bunshin is jus illusions, but real bodies like kage bunshin and the water bunshin,( which are actual real bodies) they cant c.