Let's go by parts and forget for a moment about the power scale...
Kishimoto has always made it clear that each evolutionary stage of Sharigan has always increased the user's power capacity:
As you can see in the video Sasuke when he gets his third tomoe he gets on par with Naruto influenced by Kurama's Chakra I would even say he looks superior.
I'm sure there is more data related to Sarada but I don't remember the chapters.
And Shin Uchiha is mined of Sharigans, while he was on par with Sasuke in terms of movement speed, the same Sasuke who faced Momoshiki.