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M5 is the king for performance sedans. I came from C63 AMG to M5.
You are coming from an E350 so 550i will be a leaps and bounds better in performance and technology.
New 550i have performance of older F10 M5 models. It really comes down to budget. M5 is faster and more agile than new 550.
F90 M5 will also be faster from dig, roll and 1/4 than your new C8.
Happy car hunting!
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