Interesting comments. I have a Porsche 997.1 C2S 2007 with sports exhaust and 19" Fuchs Alloys from the SportClassic.
I bought it to replace my Z4M coupe 2007 which I have owned for 9 years. Having owned the 911 for 5 months now, I can honestly say that the Z4M coupe is the slightly more desirable car to me. I have a dilemma now as I have held back from selling my Z4M coupe as I actually like it better than the 911 in many respects.
The S54 in the Z4M coupe is in a different league to the 911 engine. It feels weapons grade whereas the M97 in the 997.1 is good but nowhere near as ferocious or as hard revving as the S54. It sounds muted without the sports exhaust, certainly compared to the angry T-Rex roar of the S54. The 997.2 direct injection engine is entirely lacking in character, and needs a sports exhaust to sound even half good.
I have found that the 911 feels very much like my old 986 Boxster, just with more power and with a rear weight bias thanks to the rear engine. So much for premium feel. My Boxster 2.7 actually sounded much better to me than the 911, as it howls much louder under hard acceleration.
The only area that the 911 feels better to me is in the brakes, and actually that is really only the pedal feel and the resistance to fade, not the actual stopping power.
The 911 has a poor ride, as the Z4M, but no better. It has a poor driving position compared to Z4M, with legs angled into the middle of the cockpit, fouling against the centre console. The interior is nicely trimmed with the full leather, but actually feels flimsy compared to the Z4M. I think I could remove the centre console in the 911 with one hand and no tools. The Z4M centre console feels far more solid.
Don't get me wrong, I think the 911 is a great car still, but it is not significantly better than the Z4M all round. It's better in some areas, and not so good in others for me. Obviously it has benefitted from constant development and refinement over the years, and the the motoring press have built the 911 up to be better than it really is, helped by the halo cars such as the GT3.
So overall, as good as the 911 is, it does not embarrass the Z4M coupe and in many ways for me is actually inferior.
I suppose it depends on what you want from the car. The Z4M is definitely the more raw experience.
Think hard before you let your cars go folks!