As you may already know, the very first batches of the Canon 5D Mark III had a manufacturing defect, where light would leak through the top LCD panel as shown in this video. After a thorough investigation, Canon confirmed that the camera indeed had a problem, so it issued an official statement that it would fix the issue if you send the camera to Canon (free of charge).
Folks at LensRentals.com had a chance to disassemble both an original and a “fixed” Canon 5D Mark III and they discovered that Canon used a black tape over the camera components, which essentially takes care of the problem completely. Here is a picture of the black tape covering the components:
For more information, see this article on LensRentals.com.
I am currently working on the Canon 5D Mark III review and I am planning to publish it by the end of next week. Aside from the above issue (which is really not that big of a deal), I really like the camera so far. I was really hoping to get a sample of the new Canon 24-70mm f/2.8L II lens, but it is nowhere to be found. Once the review is published, I will be working on reviewing the Canon 50mm f/1.2L lens, along with the Canon 24mm f/1.4L. Expect some comparisons to the Nikon 50mm f/1.4G and Nikon 24mm f/1.4G.