What do you mean better specs? You rarely find a crystalwell (iris pro) Windoze laptop and if you do it just cost just as much as a Mac and comes with abysmal and cheap build quality. Windoze laptops come with lower tier i7s. The only thing that beats it is the GPU and RAM spec.I think it's still the case that you can buy a windows pc with better specs for a lower cost on average though.
Let's breakdown the specs so you can see that Windoze laptops will always be inferior to Mac except GPU and RAM:
CPU: Crystalwell for Macs and Haswell for Windoze. Crystalwell i7-4890HQ >Haswell i7-4910MQ except the i7-4940MX extreme series.
GPU: No doubt windoze laptops wins in this category.
RAM: 32 GB RAM Windoze laptops > 16 GB RAM
Storage: PCIE X4 is faster than all Raid0 2x SATA 6 SSD and a lot of PCIE SSDs that is installed on crappy Windoze laptops
Screen: 4K Windoze laptops have proven to be inferior in display accuracy compared to rMBP.
Trackpad: No need to explain this
WiFi: Windoze laptops don't have 3x3 802.11ac WiFi.
Battery: No need to explain this.
OS: OS X is infinitely times better than the atrocious Windoze.
For the same price as a rMBP, you only get better RAM and GPU. The rest of specs are always inferior to Mac.