I use Arch Linux / i3 on an early 2013 retina Macbook Pro, and it's just perfect. Took a little bit of time to set up, but everything works (including things like suspend, function keys, kb backlight etc) and with really good battery life. The resolution is just nice to use without having to worry too much about scaling issues.

I had a 32GB Dell i7 XPS15 with 4K display previously and this slightly old MBP runs Linux much better. As a bonus I can dual boot into MacOS too when I want to use Photoshop or whatever, but I very rarely do.