The Bianchi, as I found out recently loves to be riden hard especially on flat road. I find it difficult when trying to tackle long gradient as the ride from Bentong to Genting Sempah. Pacing other riders at 30km/hr or so on gentle climbs is OK, if you are drafting, but the moment you hit a steeper climb, then you find that the effort requires is a bit on the tough side. However, in sprint and pacing, i do enjoy riding this bike.
In stark contrast, the Specialized Tarmac is a nice bike to climb up from Bentong to Genting Sempah. Perhaps it being 3 pounds lighter may explain it but then (in my mind) should not make much of a difference. I find that this bike is more responsive then the Bianchi, and also more comfortable to ride for distances more then 70km. Perhaps the taller stems may have some effect on the ride posture. Need further investigation.