I like the spec on the Kestrel better, but tend to think the Specialized is probably a more aero frame(I'm not certain and how much it matters to you may vary). Really tough call for me.

I think the Spec is actually a 2010, as they didn't offer the highest end Tranny for 2011.

I think in the end I'd go for the Kestrel, the wheels are nice, Di2 is a plus, it's a pretty cool bike.