Granted I used windows all my life until a bought my first mac last 2008. I had laptops and desktops (HP, Compaq, Sony) that are all windows. In fact, my Vaio laptop before I switched to the macbook air in March 08 has higher specs than the MBA, but compared to the MBA, using it feels like crap. After a year of use, it is significantly a lot slower with all the updates and antivirus softwares etc. The OS feels like crap to use (it was Vista back then, I know windows 7 is better). The form factor is not like apple at all. The customer service of Sony is crap (called them several times because of the battery issue that was never resolved even after being transferred several times, and going to a sony store myself).
Look what I'm saying is not to buy windows but to consider that even if a computer has higher specs does not mean that user experience would be better and faster. Everybody knows that apple will update its MBP line soon. Maybe not today (although its disappointing), but soon. So those updates are likely to have the new intel microprocessors. As for me, I would rather wait and buy an apple product in a month and a half or so that buy a windows product and stick with it for 2-3 years.