First of all, this is a powerhouse of a machine in a relatively small form factor. It's also one of the first 'mainstream' laptops to feature full-flash storage as stock and not as an available upgrade (ultra books excluded here - I'm talking laptops with serious power, not portable form). Also, there is nothing on the market even remotely close to the Retina display (yet). I'm blown away by its clarity. Its also the quietest laptop I have ever owned, has the best input (trackpad) device, decent battery life, and really good sound. The OS is first-rate, too and beats Windows in form and function handily (although, with a few minor complaints).
Full disclosure: The Retina MacBook Pro I'm typing this on is the first Apple computer I have ever bought in my 12+ years of professional IT experience. I've never owned an Apple device prior to this dating all the way back to the 80's. I also own three other PCs, most are relatively new, and for mobility I only own three or four Android devices thus far. Have been running either Windows or Linux for as long as I have been computing.