If a quick BMW sedan is what you're after, you don't need to spring for a new M5 when you have this as an option.

I own a bmw 2011 550i Xdrive M sport package with M Steering wheel, M sport suspension ETc and honestly one of the best car I have ever own and still own. Reliability has been decent on my end but ...

See them compared here. I tested the 535i and 550i with rear-wheel drive. All-wheel drive is available for both of these levels, designated “xDrive.” Exterior & Styling The 2011 5 Series is ...