I just got a Madone 5.1 this year and love it. I had compared it to the Ruby Expert and Orbea Diva when I made my decision so I didn't look at the Pinarello.
I love the Trek and I think it is one of the best frames you can buy for that kind of money (OCLV carbon). Smooth riding.
My two cents, good luck with your decision. Here is what mine looks like: