I have the 4k screen on older model. It makes the ui a bit sluggish unless I downscale it. I would have preferred a less fancy screen tbh for that reason (battery would be better too)
Mostly though, I'm jealous of a friends' macbook keyboard and trackpad. My particular xps is not amazing in those areas
I use both a last gen macbook and an xps 13 9360 every day. Even after three iterations of the new keyboard style, the macbooks do not have a decent keyboard. The keyboard of the xps is better (still not as good as the perfect keyboard of an X1 or a yoga) and way more quiet.
The trackpad of the XPS is worse than the macbook, but at least it feels OK. Overall, I prefer the input methods of the XPS.
Mostly though, I'm jealous of a friends' macbook keyboard and trackpad. My particular xps is not amazing in those areas