Ben,
I've has the 1.6 Bravo and I know it only has 103bhp compared to the Alfa's 120bhp; bear in mind that the 147 is a heavy car and the 1.6 struggles a little. The 2.0 is 155bhp, but it feels way more than +35bhp over the 1.6
FIAT 1.6 is much nicer and punchier; probably the same engine block too!