So now I have Windows/Ubuntu on dualboot on PC and a Mac laptop. I feel like the Mac is basically the Unix I wanted, without the crappy window manager of Ubuntu. However, the single thing I've loved so far has not been a hardware or aesthetic manner, but rather how Mac opens windows as it boots up from where I left. I never even knew that was possible, but I feel like it has increased my productivity a lot.
I think shortly we will see the monopoly that Apple has on high end well designed laptops will come to an end.
The weight advantage of the Series 9 and the screen are nice, but battery life, keyboard and trackpad are way behind Apple's quality. My next laptop will come from Apple and i don't see any competitor coming close any time soon. Samsung will drop out of the laptop market in 2015 alltogether btw.
For me, its all about unibody. Screen quality. Trackpad touch and feel. Keyboard comfort. The rMBP fits the bill for all of these things - I'm NOT content with OSX as an operating system, however, this is just something I put up with (and since I run my Linux dev environment in a VM, big deal anyway). I'm certainly not a typical Mac user - I spend 99% of the time in the terminal.
I've looked at the Google Pixel series, and some of those look like they come pretty close - except I have no desire to use a Google operating system, of course .. and they're just not available locally, like the rMBP's are. But if there were a manufacturer who puts together a machine that has the physical characteristics of the rMBP, I'd happily abandon Apple hardware in an instant.