2010 S3 vs 2014 S2

Would appreciate some advice if anyone has a moment/inclination. Am considering either a 2010 Cervelo S3 with Dura-Ace & C50 tubulars or a 2014 S2 as per the showroom spec - 105 group etc. The older & used S3 is actually cheaper.

Is the 2014 frame THAT much better?
How does 2014 105 compare to 2010 Dura-Ace? Apart from 11 vs 10 speed.
Which one would you go for?

Plan B is stick with my current Pinarello/Campy set up and do nothing.
I ride mostly on the road, occasional sprint/oly/70.3 race.

thanks!

I cant comment on the S3, but I have a 2014 s2 (10 speed) and love it. Used to have a 2012 madone before

I have a 2010 S3. It is a great frameset, I love it. Cheaper and with Dura Ace carbon wheels? Seems like a no brainer! Get the S3, get new cables/housing, new chain/cassette and new rubber. Maybe get the wheel bearings repacked. Voila, way better than a new stock S2!!

That said, no idea if it is worth it to you to switch from your Pina, or what model/build you have.