Interesting thread.
I have a 2019 X5 and a 2018 540 (which I love), with that lease up in December. I'm starting to think about ordering now and have been flirting with the M340, but have similar concerns about the relative interior quality. Also considering another 540 or possibly jumping up to the M550. Waiting for the US configurator to go live for 2021 models so I can do some builds and see how they would price out.
For what it is worth, I have a friend who has owned several 5 series, most recently a 550 in the prior body style, that he replaced with an M340. He says the M340 is the best BMW he has ever owned. Obviously, not a direct comparison between the old 550 and the new M550, both in terms of interior and the engine.
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