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I have a 535i (Touring). UK based.
I also have a Porsche 911 (an old one, 993 model) and until very recently an M3 CSL. Before that some Audis (RS4 and RS6). Etc.
To my mind you are comparing apples with oranges. I like my 535i, and it does the job it was designed to do (comfortable, quiet, sophisticated) really well. But that success also means it's really boring to drive. The same was somewhat true of the RS6 - quite fast but not involving. The Porsche is probably no quicker than the 535i, but it's massively more fun.
So I think if you don't have other cars and you enjoy driving, there is a strong possibility that you will regret moving to a 520d. But only you can decide!
If I were you I'd get a 520d for at least a whole day, and drive it a lot. My local dealer was completely fine with whole-day / whole-weekend test drives.
Cheers, Richard.
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