Yup I have a rMB 2016 and a rMB Pro 15 2013 inch as well as a Surface Book. I know it all sounds excessive because it is.
The MacBook Pro 15 inch used to be my main and only computer. However, since Windows 10 was released, it was mainly running Windows 10 under Bootcamp and Parallels. My main workflow is dependent on Microsoft Office (Excel and Outlook) and the Mac version of the latest Office, although much improved from previous versions is not even close to the Windows counterpart. Nowadays I just use it for Final Cut Pro and Aperture (have yet to switch to Lightroom). I know I can sell it for over $1000 but this thing is worth more to me than that so I will probably keep it till its death!
My Retina Macbook is my vacation / mobile laptop. It also runs bootcamp in case I need to use Windows. It mainly resides under my bed to get some quick work done in the morning. This is the best travel laptops you can get because it's thin and light, gets way more things done than even a standalone iPad Pro and my favorite feature is that you can charge this off a battery pack or any USB charger with a USB-C to A cable.
My main machine these days is now a 2016 Surface Book i7 with Performance Base (I traded in the SB I picked up about a month and a half ago) which resides at my desk and I take it with me to work. It is probably the greatest laptop I have ever owned. On top of this being docked at my desk at home to do work and play games (yes it runs Overwatch in 2560x1440 beautifully), I find my self detaching the screen a lot at work to take notes, hand to my VP to sign documents as well as pass around to my employees and colleagues in meetings. It is unfortunate that Apple hasn't embraced a real touch interface on their laptops because it really does make a difference in interacting with your workflow. The battery life in the new Surface Book is also very impressive. I can get through an entire day and night without having to charge this.
If I wanted to downsize everything here, I would keep the Retina Macbook just because of its versatility in being able to run Mac and Windows, edit videos in 4K with very little sacrifice in performance, and how portable it is!
Sorry for the long post. Just my two cents