I have a new 330i courtesy car, and have had it for 4 + weeks while the m550i has been rotting as it awaits a new front strut. The best part about the 330i is how amazing the m550i will feel once I get it back again. The 4 banger is ok, boots along fine, but I couldn't imagine a similar 4 cylinder in a g30. The 535i would be way quicker but as others mentioned, you gotta drive it to see for yourself.
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