Well in just a few words
I have 550i Dinan stage 2 with many other cosmetic mods
And currently considering change and have been considering CPO CLS63 vs Audi S6 2013 or the F10 M5 and test drove all of them and wanted to share and ask for more insight into this tough choice...
I did like the S6 more than my Dinan Stage 2 550i pretty much in every aspect including the smoothness of power delivery though may be mine felt a little more powerful.. HUD not that nice and award positioning on the dash! Sticks out badly! A esthetically not palatable -... I hated the Audi S6 shifter ... hideous ... Seat were good but nothing like the M5 or the CLS63 2012 ... I do agree that rear look bad on S6 though front with those LED is sweeeet though bot aggressive and those can cm be 2 different things... and I like aggressive more than sweeeet... fully loaded will be around 70k-72k loaded
CLS63 I test drove it with the performance package sticker price 122k launch edition ... I loved it but was to jarring yet super fast ... Nav was tiny and in general theme is older than I want it to be... though probably best material when it comes to interior over all and loved that MB new AMG hollow shifter... but no HUD option !!! R u serious MBenz? Stance is probably the lowest and the most aggressive amongst the 3 if these monsters... Best exhaust nkte amongst the 3 by far. The Alcantara wrapped steering wheel with flat bottom is A piece of ART!! ... Price 78k-82k used with performance package
Lastly but not the least the ANIMAL ... The beast .... The M5 ... too many things I lived... but overall it is the only car the felt at home to me ... and the most complete package... Can't imagine with the COMPETITION PACKAGE how better it can be!!!
Well acceleration is out of this world in delivery and you know what people complain about traction issues... well ... When u r driving 50 and stomp on the gas and you lose traction ... There is no better JOY ... hahahaah... intoxicating to feel this type of power... Surely underrated HP 560. . No way must be north of 600HP easy... by butt dyno - and he's felt more agile to me than CLS63 and easier to toss around and drove smaller than my 550i 2012 F10. .. SWEEEEEEEET steering ... I hate my numb electric eerie steering of my 550i 2012 F10 and M5 steering can be a little heavier or should I say appropriately so... tighter ! Yes but in a good way...
Instrument cluster is best in the S6 by far and hands down!! Wood trim is nice but better design in other 2... love it though when it is Carbon fiber. .. rear wheel need to be beefier?? Don't you think?? Exhaust note here is way better than my 2012 550i but nothing as glorious as M5 or the crazy CLS63 AMG which is the best....
Guys ... comparing Audi S6 to the M5.. please are gimme a break here... 2 completely different animals!! In everything...
What I agree on is that Audi S6 sits between my F10 550i and the M5 and yes I agree it is closer to the M5 than it is to my 550i EV - and I say that because my car is so silent in a bad way a boring way ... So fast and power is almost close to M5 level but with the wrong suspension and sitting higher and electric steering and 19" wheels with Dunlop RFT on my F10 550i they are world's apart... and please guys who are spending all the money in the world to turn F10 550i into an M5 with Dinan stuff... stop wasting your money even with stage 10 -; ) You won't be there trust me.. especially that Steve will never be able to touch your steering unless you have 550 Xi then you have the hydraulic steering and heard that the new sports 740 I believe that's what they call it the sports suspension it is a better LCI 2014 550i... but I rest my case I guess and no more chasing the M5 with my Dinan mods... which seem to be a waste of money...
The only thing I didn't like a bit the M5 is the cheap finish of the buttons around the shifter and this console could be a letter better ... take a look at the CLS63 console and you know what I am talking about.
M5 fully loaded sticker price 104k and asking price used with less than 10k miles on It 85k and I believe I can get it for around 80k.
Waiting for your input on this.
For now I am getting out of my 550i Dinan Stage 2 with 30k miles on it and asking price 49950$ and for now my next car is M5 unless someone here is going to be able to convince me otherwise.
On my 10/10 scoring system over all
My f10 550i: 5/10
Audi S6: 6.5/10
CLS63 AMG: 8/10
F10 M5: 8.5-9/10