I went to take a close look at a C63. Outside of the 6.2 liter engine (that has even more displacement than a GM 350!) and the accompanying exhaust note, the rest of the car doesn't do it for me. The interior of the car does not appear to be on the same level as the 92X's. The bonus points for the C63 going to the more modern dash gauge/cluster. The exterior, I just couldn't feel it. Personally, I think the C63 sedan looks better than the coupe.
Afterwards, I went across the business park to check out the 991 at Champion Porsche. While driving through the dealer lot, the owner of Champion Porsche complimented my M3. Verbatim - "That's a Really Nice Car". Dave Maraj the owner of Champion is one of the biggest car enthusiasts you will find. On top of winning Lemans and Sebring. He know's cars..Over the years, I've met some cool folks there including Hans Stuck and Bill Adam when they drove for Champion.
Back on topic:
The C63 is a nice car - it just doesn't have the design/engineering prowess of the M3. IMHO
Finally got a chance to take a good look at the 991, a logical progression from the M3
I also got a chance to go on a spirited drive in a Panamera GTS - nyccee!!