Hi,
as I have a late 2016 MBP (new model 13" with TouchBar) and an external screen (BenQ SW271, 99% Adobe color space), I’ve made some tests to check if I can reproduce Adrain’s issue, and yes I have the same issue, but I have it also on the MBP screen when BenQ is detached from MBP.
Like above, the image is reddish in DxO Nik, tried with Color Efex and Analog Efex.
Below a copy screen with Viewer (it’s the same in Photo) and Analog Efex with no correction as seen on the BenQ:
The image is a jpeg coming from Photolab with Export color as Original (From Nikon NEF with sRGB) so sRGB as defined in exif.