507 replaced the ppp option, but lost LSD as standard. Does have composite discs and red calipers. It's the rear discs that are particularly expensive to replace, I think due to limited production as being unique for this model - unlike the fronts.
Most have silver forged 19" alloys (black is an option). 18" 5-spoke alloys were a 'no-cost' option, though I've read there were some supplied with them due to difficulty sourcing the unique 19s
The power and torque is the performance media pack. Not standard, and a fairly costly option. I think the AMG switch is part of this package (it's not on my 507).
There are some other cosmetic details (slightly darkened lights front and rear), black mirrors and grill, badge on alcantara gear lever etc that are very nice touches IMO, but you probably wouldn't miss them if you never had them