Sorry, but which Apple in an 86-90W power supply is fast, has a large amount of ram and the graphics performance of a GTX 960M? The GTX 960M chip alone takes 60 watts, and Apple only offers integrated graphics. Add the 60W GPU to Apple's 90W machine and you're up to 150W.
So I'll one up you. You didn't specify thickness so I could pick a 1.5" thick Alienware, but I'll do it in a 0.7" thick form factor to disprove the Apple myth you need to sacrifice performance to make it that thin. Razer Blade 2016 edition QHD+. 14" 3200x1800 display, Intel i7-6700, GTX 1060 6 gig, 16 gig of ram standard, standard PCIe M.2 with up to 1TB preinstalled.
Before you start poking holes, and looking for the one insignificant detail where Apple wins, it has Thunderbolt 3, it has USB-C, stereo speakers, built in bluetooth, etc. It's also a capacitive multi-touch screen and a gorgeous machine with an RGB backlit keyboard. And it's cheaper than the 15" MBP.
And if you really want thinness, the Razer Blade Stealth matches the 0.52" thick rMB. But Razer still gives you the quad core i7, a full 4k screen, a larger battery, and its cheaper. And you get to keep the RGB keyboard from its bigger brother. It will run rings around any current mac laptop, but you do lose the dGPU so it doesn't meet your original requirement.