Re: Sport sedan
I'll take the M5 when I want enjoy and be involved in the drive (from what I hear).
E55 is a great sedan though and I would probably buy one before the M5 because I like the comfort, styling, and everyday drivability due to its massive low-end torque.
They're my two favorite sport sedans, but it's hard for me to compare them becuase I've never driven the new M5.