My 2012 BH G5 weighs right under 15 lbs. with a SRAM RED build, and Reynolds R32 wheels on it. It could be lighter, with different wheels, bars, stem, and saddle. It's a very stiff frame, and very fast, as well. I've used it in road races, and crits, with great results (the bike, not me) in both. I primarily use it as my racing bike, as it's too stiff for my old bones to ride every day.
My frame has a 57.5 top tube, if size is of consideration.
Spot on. I have a 2013 Ultralight with full Campy SR11. Incredible bike for speed and climbing but for anything over 50 miles I ride a different bike. Then again, I'm 55 and not a spring chicken. May let it go for something a little more forgiving.