My dad had a 320d M Sport from BMWs for a short while. It felt very similar to my mates fiesta RS Turbo in the sense that when the boost came in, it was leaving things very quickly and the there was a massive surge of boost as well! May ot be as quick as the petrol equivalent but certainly feels more poky to drive because of the boost! I thought "fuck me, I didn't know a diesel turbo could be this much fun!"