My 1.4TDI has a small delay from pushing pedal till gogo, but i put that down to a little turbo lag, although when you rev it in netural, there is a small delay which i put down to the drive by wire.
My mates old 1.2 used to be pretty responsive and eager to rev. They have alot of low down power for a small petrol engine which makes them good around town, just theres not much to gain in the top of the rev range. Ive never driven one of the 1.4 petrols though.