I recently took delivery of a Canyon Ultimate, set it up and have done around 200km on it so far.
Reading on here about a fork failure due to a loose headset, I did the old "lock the front brake and check for wobble up front" thing this morning - of which there was some. I didn't have time to deal with that before work so I left it until this evening,
The bike has an Acros headset (not sure exactly which model), I did some googling on the subject and although most of the instructions didn't seem relevant I basically took the stem off and put everything back together again this evening with an extra 1mm spacer which I'd left off before.
What's interesting is the wobble - upon closer investigation it's still there, albeit better than before, subjectively at least. According to my fingers there isn't any movement around the headset - it's actually the Mavic wheels.
You can see a couple of mm of movement on the tyre with the disc brakes locked on, again I don't really feel any movement around the headset.
By my eye, the fork and disk brake are solid and not moving - yet the hub and wheel have a couple of mm of play in them. The rear doesn't behave the same way (obviously hub internals are different though). I didn't get a chance to remove the wheel and check for any play in the axles/bearings yet - but it's weird as there would have to be some play between the centrelock disk rotor and the hub itself (which doesn't really make sense - I've not dismantled these ones before, but all my other centrelock wheels have those little teeth for the rotor on the hub casing itself).