Have you driven a S63? Completely different car.
If you are even thinking about a Mercedes S class, a Porsche is (and probably was) completely wrong for you in the first place.
I had an E63 AMG, sold it after only 6 months. Had a C63 AMG Coupe, loved it but traction issues made me sell it too.
If you are looking for a fast and luxurious Autobahn car, get the S63 AMG. You certainly won't be disappointed.
However, don't even think about sportiness because the S63, despite the AMG brand name, is the typical S class Mercedes.
If I would have to choose a daily driver and I couldn't care less about my customers or social environment, these cars would be on my list: Porsche 991 Turbo S or Ferrari F12 (maybe even the FF up to a point...for the kids). My wife would probably love to get a Bentley Continental GT Speed Cab as a daily driver.
Mercedes S63? Well...it may fit Frankfurt quite well.
I don't know how old you are but I am 49. In the Panamera, I always felt 10 years older than in my 911. Just saying... In the Mercedes S class, I actually feel 20 years older. I love Mercedes, especially AMG but I would never ever get a S63. Rather a G63 or a even a SL63 but the S class, despite it's amazing electronic gadgetry, never. This is not the type of car I would enjoy as a Porsche driver, I want something dynamic, fast and...sexy. (my wife and her girl friends love the wide butt of the 991 Turbo S ...weird...actually thought this is a men's thing ).
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RC (Germany) - Rennteam Editor Porsche 991 Turbo S, Porsche Boxster S (981), Jeep Grand Cherokee SRT (2014), BMW X3 35d (2013)