Difference between 2013 and 2014 Zipp 404's - worth paying for?

So, I'm in the market for new wheels and have decided on a set of Zipp 404's (firecrest clinchers) - front and rear. Shopping around (I see them cheapest on jedi sports and bike24.de) I can see about €400 of a difference, if not more, between the 2013 and 2014 models. I wonder is it worth paying the little bit extra and getting the latest if I'm paying that much to begin with? or would I would I even notice the difference?

Doing a bit of googling I found a good bit of chat here where they were saying

http://www.velocipedesalon.com/forum/f2/zipp-2014-a-34986.html wrote:

the new 2014 404 FC wheels have 100% (!) more torsional stiffness due to the new beefier hub and four added spokes (adding 90g of weight to the rear wheel).

And also on the main product page they say

http://www.zipp.com/wheels/404-firecrest---carbon-clincher/ wrote:

Cavendish received early hub prototypes in January 2013 and logged 13,000 kilometers (8,078 miles) on continually refined variants, including his stage victories at the Giro d’Italia and the 2013 Tour de France. His feedback helped optimize the hub’s flange geometry, stiffness and weight.

Good marketing talk alright. But would it be worth the extra money.

It's funny, I'd no problem buying a previous year bike to save some money but I'm struggling to allow myself do the same with these wheels. Any thoughts? What would Jesus do?