I got my 1Dx back yesterday (Wednesday 26th June) after being collected last Thursday, 20th June. When it was away I asked if Canon would do a complimentary sensor clean. I wish I hadn't, it came back worse than it went away. 3-4 foreign bodies including 2 hairs on the sensor as well as several remaining marks. I sent Canon an image showing the issues and made a call to them, I'm waiting on them coming back to me tomorrow morning to confirm it going back for another sensor clean. I'm taking it to Tuscany a week on Saturday so I'm slightly concerned it wont come back in time as UPS, Canon's courier only delivers to my town Mon/Wed/Fri.
Really disappointed in Canon QA systems, that's 3 times in less than a year the body has been in for a sensor clean and each time its come back its not been perfect, this time its by a mile the worse its been.
I have to say dealing with the Admin Staff at Canon (Centenial Park) is a pleasure, they are very helpful, its just a pity the technical staff dont back them up with similar service.