I have a mk3 mondeo diesel, and it only sounds transit van-ish when cold (this is the old transit noise, because newer ones have the same engine as the mondeo!).
Once warm enough (within less than a mile), and at speeds above idle, you could not tell whether it was petrol or diesel really. And it doesn't get particularly loud at 3k or above.
Although your mk4 has an entirely different engine, it doesn't sound right. Perhaps you should ask the dealer to lend you a different mondeo for a while and see if it's the same? Or just take a test drive at any dealer.
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