You can always put skinnier tires on the hybrid which would help - or try a lighter wheelset? My assumption is the wheels on that bike are pretty heavy, though you may not want to go this route.

Others have already mentioned that the weight of the bike is only one component in speed and climbing. There are just so many dynamic factors contributing to this. For example, I am slower downhill on my beloved Gunnar - for the very reason why it is a little easier climbing hills on her. She is 10.5 pounds lighter than my LHT, which helps going uphill but hurts on the fun side - less weight pushing me down that hill.

As far as my overall speed is concerned, my average speed really hasn't changed much. It is a little higher, but not significantly different. What IS different is my quads burn less when climbing, and I am a little slower on the other side - but I can go longer before I start getting tired.