It just occurred to me to wonder if you were drawing comparisons between the Saab diesel, which is no doubt turbocharged, and the naturally aspirated GDI Morgan. There is a world of difference between the flat torque curve of a turboccharged engine that kicks in at low revs and the torque curve of a naturally aspirated engine. I would expect it to pull cleanly from about 2500 rpm and gradually pick up to about 3500 to 4000 where it would really start to kick in. I can cruise happily at 3000 on the Autostrada and around town even at 2000 rpm though if I am doing 50 kph I am likely to be in 4th, not 5th gear. If I need acceleration I would probably drop back at least one gear if not 2. Once above 4k things really start to happen.
In my case I have the Morgan and an automatic diesel AWD Jaguar XE: obviously the driving style required by each car is quite different -