I am not a believer in 2008 changed the world of fender. There AV series has been really good the only time its been around I have played various years and not noticed a difference.
Also i had a usa 2004 P bass-great bass , i had a 2008 fender P bass in charcoal frost , crappy bass, i had a 2009 in oly white , great bass.
I think the 2008's really grabbed people due to the fact the case was sturdier , that doesnt apply to the bass tho , the tuners looked a little better on the back but still hipshot and then the thinner paint-well sonically thinner paint wont change the sound much at all.
Really I think fender came out with some new hardware and no S1 and thats what got people all over them , I really dont find them any better then early 2000s in terms of construction.
I also think the lower mass bridges on the pre 2008's were better looking.