I noticed the same thing when I bought my 2.4. However, I didn't mind and went on and bought it... and when I picked up the car, I realized that the car had been standing still for a few months, and consequently somehow the steering felt stiffer because of that (steering liquid/pump issue?). I noticed that the car had been standing for some time as the previous registration ended in January and I picked up the car in June, so 6 months with an occasional test-drive every now and then (it was at a VW/Seat dealer, and one of the very few non-VW/Seat cars over there so obviously not the center of attention for potential buyers).
Needless to say, the steering got noticeably easier when I picked up my car a few days after I test-drove it.
However, it is true what giblets46 is saying: I didn't pay too much attention to the steering until I recently drove a new Honda Civic - it felt like I could steer the car by blowing on the steering wheel in comparison to the 159!
The steering is great though - you can tell that it was designed to drive at high speeds, unlike the Honda.
Mediocrity is a sin - Alfa Romeo