Well I've had both back to back and at the same time.
I stand by that statement. I respect if your views are different, but IMO the F10 just outdoes it on so many levels, if I'm being dramatic then "The E drives/feels like a 10 year old Taxi in comparison (2011 E350 well equipped VS pretty loaded 2013 535i specifically)". I'm not saying it LOOKS like a 10 year old Taxi in comparison, but the drive and interior namely, and of course the technology and engineering methods.
The F10 drives better than a pre-facelift (not sure about facelift as I haven't had much seat time in them) W221 S-Class in my opinion. And before M-B devotees call for my head again, there's a Member on the M-B and BMW Boards names "Emilner" who went from an '07 S550 to a 2011 550i (when it was a newly launched body, he now has a 6er Convertible) and said that his F10 did just about EVERYTHING better if not just as good. Was at least close to or about as smooth, even quieter, far surpassed it in driving dynamics and of course technology was on another level. I thought he was crazy and I think poked fun at that statement when I heard it, but now I see what he was on about. Of course he was looking for something tighter and more dynamic than the strictly-luxury S so that skewed his (and my) perceptions.
This car is really ridiculous, I've never driven anything like it. I really am not trying to throw the E under the bus to enact some misguided "revenge" against M-B for feeling like they tried their hardest to kill the magic of their brand for me.
This car is SERIOUSLY on another level. Remember, my F10 is pretty well loaded and has some new tech that we got for 2013. The sense of occasion and all around "cutting edge environment" vibe you get from it truly makes the E's feel almost mundane.