Worth it? How do you use your laptop? Do any of the features provide additional/incremental value to you? As with the majority of goods, value (and therefore, worth) is highly subjective.

EDIT: For me, the 13" Retina MBP does nothing that I wish I could accomplish with my 2011 13" MBP with 8 gigs of RAM and an SSD. It doesn't make anything that I currently do faster/easier/better. Therefore, not much incremental value to me. When I look to buy my next laptop, the Retina series (if its still a different product line by then) will be at the top of my list. I'd love to buy a laptop with an SSD, RAM and that wonderful screen - they just don't provide enough value to overcome the acquisition cost for me.