It's virtually indistinguishable. As such, I love it.

Comparing the 53cm 2013 Jake geometry to the geometry of my 54cm 2008 Major Jake (and I believe the geometry is the same between all the Jakes through 2010):
-the effective top tube length is 1mm shorter on the new Jake (550 vs 551)
-the head tube angle is one degree slacker on the new Jake (71 vs 72)
-the fork is six millimeter longer on the new Jake (398 vs 392)
-the chainstays are 10mm shorter on the new Jake (425 vs 435)

I can't feel any difference. As far as fit goes, the stack and reach are both within a millimeter between these two bikes.