1.86cm, and when doing hard training (weight training) weigh around 98-100kg, 10-12% body fat. Recently been cycling a lot more, and weight has dropped down to 92/93kg, and the difference up hills is remarkable.
I thought it was the weight difference of the 2 XC bikes (comparing normal to carbon wheels, 10.3kg vs 9.8kg XC bike, 1 vs 2 water bottles, camelpack vs bottles, spares vs no spares, etc, etc, etc...) until I realised that it was body weight, plain and simple!
Even with a 2-3kg difference in body weight, I can feel a SIGNIFICANT difference when riding uphill, and over technical terrain. Difficult to admit for a newbie, but I've learn that body weight is where it counts most