The Scott Addict R2 has Ultegra 6700 and it's not hard to the bike down to sub 16 lbs with clinchers. That bike lists for $3300.

If you want to step up to the Scott Addict R1, the price doubles (almost) to $6500. Here's what that additional $3200 gets you:

A 100 gram lighter frame.
A 60 gram lighter fork.
Ksyrium SL wheels (upgraded from the Elites on the R2)
Dura Ace 7900.

In comparison the Ultegra spec R2 is a screaming bargain. But a similar relationship exists across most bike lines, the Ultegra bikes are often the best deal overall. The discrepancy in the Scott line seems rather glaring; it may be because that R2 seems priced kind of aggressively, some other brands get more for their Ultegra bikes, but most seem to fall in that $2500-$3500 range with 6700 these days.

I own a bike with Dura Ace 7900. I think the Ultegra actually shifts better. Feels like a pro bike in every respect. Pretty light too.

It's a testament to the bike weenie proclivity for overspending to save a few grams. Thank God I'd never stoop to that.