I think it's as mentioned, maybe it's refinement etc.
When I did a test drive (admittedly on a 2.0 TDI GT DSG), it didn't feel as quick as the 2.2 i-DTEC Civic I was in at the time.
In reality, the two cars are very similar in power, torque etc, but it just felt like the Civic was quicker, even though it wasn't. It's just that it does it so easily I think.
But that being said, similar to your Roc's, I was in an A4 Allroad with the same engine (well actually it was the newer 177), and in 6th, that thing pulled ridiculously good. Would hit the torque straight away and accelerate, hardly any turbo lag.