Actually these are great comments as right now I am struggling to decide what to do with my Z in the near future. When I characterize the M4 as being dull I am saying that in relation to the feel of the Z, which to me feels like you are riding in a hovercraft after driving a sedan (sports coupe, M4 included).
Granted it was a test drive and I would probably get to love the M4 when the sales dude isn't sitting there right next to me.
The options I am looking at are:
1 - Keep the Z and get it tuned
2 - Keep the Z (and boost it) and get a supercharged 4Runner
3 - Keep the Z (and boost it) and get a BMW 335i/435i XDrive (and get it tuned)
4 - Sell the Z and get a BMW M4
5 - Sell the Z and get a Lexus RC F
6 - Sell the Z and get a Corvette Stringray
7 - Sell the Z and get a Camaro ZL1
8 - Sell the Z and get a Subaru WRX STI 