[Terrier15]

M4 wasn't CP. My initial impressions:

- ride comfort is markedly improved in the M5, including the seats themselves. They're much more supportive and I sit at a better angle that allows the lumbar support to do more good.
- cabin is quieter as well, though the M4 wasn't bad
- M5 is an absolute monster all the way through the power band. It has significantly more power than my M4 in every situation whether it's off the line or punching the gas in 5th gear on the freeway. Of course, it has the horses, but it's surprising that this sedan blows the doors off my old coupe.
- fit and finish throughout is much more refined

Totally worth the price difference to me... and I did get it for 7K off sticker