I'm interested to understand any thoughts that people might have regarding the price differential between the 3 and 5 series. I'm from the UK and recently moved to the US, and was very surprised to see how much more expensive a 528i would cost to buy as compared to a 328i.
As you can see from the below, where I've tried to align specifications as best as I can, bearing in mind what comes as standard in each country on each model, taking away the fact that the UK price is way higher than the US price in the first price (US sales tax reduces this difference a little), an upgrade from a 328i to a 528i isn't such a big deal price-wise in the UK, but in the US, it's 25% more expensive.
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Why might this be? As an aside, the differential is even smaller if you look at a 320d diesel vs a 520d diesel...