I'm interested in this also. After selling a kidney to buy a pair of Scarpa Mont Blanc GTX boots and finding my feet get wet shortly after the leather becomes saturated (pretty easy in this spring snow) I'm going to start looking into leather boots for the future, at least to replace my approach boots.

Don't get me wrong, the Mont Blancs fit like a glove right out of the box. They required no breaking in and are performing excellently. They also insulate quite well, even when wet, it takes a long time for my feet to get cold (there is enough space in the toe to let me move my toes also). But, I live in a rain forest, I need waterproof I can rely on, even if that means a few weeks of blisters as the boots break in.