What laptop do you use for photo editing?

Jemlnlx

Itchy shutter finger...
I have a Lenovo y700 (4K, i7-6700HQ, 16GB Ram, 256 GB SSD and GTX 960 4GB Video Card) which I use for casual gaming, photo editing and minor video editing. Due to sub-par color accuracy I sometimes connect it to my external monitor (QHD) for editing. I am looking into getting a new laptop for editing. I was thinking of the XPS 15 - 4K (maybe), i7, 16GB, 512 SSD, 1050Ti.

Does anyone have any experience with using Dell XPS laptops for photo editing? Is the 4K worth it? If not, what do you use? Any recommendations?