Aaah okay - thanks, that makes sense now.
I actually went and looked at one earlier today and could tell the difference in the sharpness - particularly of text, but to be honest overall it didn't look that much better than the standard Macbook Pro when viewing photo's and using it for web browsing (which was all I could really try out in the shop).
Certainly the claim that someone else on here made about it being like going from VHS to Blu ray is grossly exaggerated.
DVD to Blu Ray maybe.
I've decided I'm sticking with my antiglare 2011 Quad core i7 17" until it dies. Now Apple have killed the 17" model off, I'm not sure I could regress to what is (effectively) a 1440 x 900 resolution again and a glossy screen, however much clearer it may display text. I'm also one of the few who actually still uses the DVD drive regularly too, so it's omission from the retina model is an issue for me, so it's not going to be on my 'to buy' list just yet.
If it gets better and cheaper over the next couple of years, then I'll take another look in 2014.
Right now though, it looks like my beloved 17" is going to be with me a long time, which is fine as it's a fab piece of kit!