How about more specifically:
Maxed out 13" MBA
2.0Ghz i7
8Gb RAM
256Gb SSD
Intel HD4000
Vs.
Base model 13" rMBP
2.5Ghz i5
8Gb RAM
128Gb SSD
Intel HD4000
Both priced at $1699 (US)
Which would you guys buy?
Don't forget about the rather HUGE difference in displays. But I still prefer my old Air (and will plan on buying one with the next update) over the rMPB - too heavy, too thick (thicker than the 15" version), and too little of a performance advantage to make it better than the Air.