My climbing bike, Wilier Zero.6 (Sram Red) is awesome on steep hills. At 5.8kg (weighed yesterday) it is ideally suited.
Yesterday I took delivery of my new bike, Trek Madone SLR 6. The idea is to upgrade the groupset and wheels but even in its current 8.4kg configuration, it proved faster on the flats today - marginal sure, but 14 seconds gave me the KOM.
I race...this will be my bike of choice on less lumpy routes.