Why do people photograph their frames nose-down? They look far better balanced on bb and dropouts.
I find it hard to understand how a frame of that size, with such fat tubes and a gusset could possibly weigh as little as 3.85lbs. Tubes weigh what they weigh, and having an excellent firm of welders join them up doesn't make them weigh any less. I have two 853 frames, both in smaller sizes and with much skinnier tubes and they weigh 4.25 and 4.35.
My '95 17" Tangé Prestige custom drawn Moron tubed Ibis weighs in at 3.9lbs
On the other hand: My '01 Ibis Mojo (Deda tubes) weighs 4.3lbs
Most of the time the chainstays are not the same material and S-bend ones are havier... There can also be a lot of weight in the BB shell and head tube.
BITD Vertigo made steel frames that were just 3lbs...
...and I didn't mention the Reynolds 953 tube set yet.