Just tried the calibration. My TV didn't have every option the Xbox suggested changing, but it does (so far) seem better.
Oh, and something for those who stream media:
I tested
Skifta earlier this evening.
Rather than install the Skifta software on my iMac, I had a go at using PS3 Media Server instead, given that I already have it installed and it's what I always used for the PS3 and 360.
I installed the Skifta app on my iPhone, selected PS3 Media Server as the source and the Xbox One as the destination, picked a video, and... it worked. Mostly.
One video stuttered every few seconds (even though the iMac and Xbox One are using Gigabit Ethernet and the iPhone is using WiFi N), but a few others I tried streamed perfectly.
Forwarding/rewinding doesn't work well, though, but you can at least pause/play.
It's not a perfect solution, but it's certainly an option for those who have no other choice.
As for me, I'll probably stick with using the PS3 for now. It's easier.