I have an iPhone 5 and iPad 4 and a overclocked 4.4Ghz i7 PC for the number crunching - with a home server on Gigabit ethernet and Wireless AC; all streams and works very well.
Don't think I could justify 2k on a 15inch laptop, no matter how sexy it was; although I don't need real power on the move, do you?
If the laptop was to make way for your desktop and you need it for regular mobile activity, then I'd probably consider it.
The good thing about Apple products is their resale value.