I’m editing some R3D 5k just this morning on a Early 2103 MBP. 2.7i7, 16GB ram, 512 SSD. I’m using a SSD on a Seagate Thunderbolt adapter as my media drive. Works best at 1/8 resolution and easy enough to cut that way. The new MBP’s have a better card with 2GB ram as opposed to the 1GB in my set up.