2013 - 2015, pre facelift MacBook Pro 13. Great Linux laptop, and a nice resolution without the scaling issues you will probably run into with a 4k screen. I run arch/i3wm on mine and it runs great. I had a new MBP like yours, but 'downgraded' to a 2015 model because it runs native Linux much better, and the keyboard is much less hassle too.
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2013 - 2015, pre facelift MacBook Pro 13. Great Linux laptop, and a nice resolution without the scaling issues you will probably run into with a 4k screen. I run arch/i3wm on mine and it runs great. I had a new MBP like yours, but 'downgraded' to a 2015 model because it runs native Linux much better, and the keyboard is much less hassle too.