A though occured to me today on this subject actually, the 172 I had was very "cammy" and below 4k was pretty unresponsive, obviously the way they set them up to give the incredible mpg you get on the 172 which is great, but when you rev it and it comes on cam you get a turbo like shove and you have to keep it above 4k to avoid dipping into that economy zone so to speak.
If you were blindfolded and drove the 172 and then jumped in the 225 and had to guess whoch was the turbo car you might think that the 172 was the turbo because of this sort of lag effect as the power delivery on the 225 and from what Ive read other cars like the leon, golf gti etc is pretty linear