You can't copy muscles,Sasuke trained in order to attain Lee's high speed Jutsu.
When Sasuke copied Lee's Taijutsu,and used it in the prelims,he felt the negative impact because he didn't train in order to attain a body suited for High Speed Taijutsu.
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During the time they had to prepare for the finals,Sasuke spent time training with Kakashi.
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You can't copy speed,and body performance,lol.
Sharingan can't copy muscles,and body performance.Are you this dumb with any other character?
So you are saying Lee would have killed Sasuke? Lol.