I've had running Funtoo quite a time on this laptop. Worked very well. Only thunderbolt hotplug isn't working (will change with kernel 3.17). This is not Linux fault it's how it was implemented by Apple. Meanwhile I've installed ArchLinux for some reason. Here http://iocrunch.com/2014/02/linux-dual-boot-on-mac-with-full-disk-encryption/ you can find some hints e.g. how to install refind. The blog is for ArchLinux but a lot of parts are also true for Funtoo/Gentoo. Also check the ArchLinux wiki which has a lot of hints even if you run any other distribution. But meanwhile most things work out of the box. So if you've manged to partition the disks, install refind, ... most things already done and you can install Funtoo/Gentoo as you usually do.
funtooix got a reaction from jubalh in Funtoo on Macbook Pro Retina