How are the LTE speeds currently on your X? & are you guaranteed twice the speed on most days?
Looking at my fastest speed tests: 254 down / 123 up. Although, the network here may be in better shape than over there (apparently, it's one of the best...).
With the camera boost, I can only really see a benefit if you plan of blowing up photos to wall mount. I mean it's not like the X camera's poor by any stretch, so what will the new camera of the XS allow you to do? I'm wondering if the 30% larger sensor will be noticeable - serious question as I'm no camera expert. Will it mean shots in all environments will turn out better, or is it mainly low light shots?
I'll have to test the LTE speeds, but the camera is definitely a step up that any photographer will notice. The autofocus is LIGHTNING fast (honestly its kind of mind blowing, even compared to 5k FF DSLR's) and the dynamic range is impressive. It pulls way more detail out of the highlights, especially at night. The sensor is going to give you better pictures in all conditions, but definitely will have more of an impact at night as it's gathering more light for the same shot. I've been messing around with the after shot bokeh control as well and its actually a really cool feature, its nice to have that additional level of control.
The X has a great camera, the XS just has an even better one.