I've noticed my 70-200 is slightly loose on my 1DX. A little bit of rotational play, which I understand is normal. However there seems to be a very slight amount of vertical play. If I grab the lens hood and body and sort of tilt up and down between the two, you can see the play between the mounts (again, a small amount...) Also, just holding the 1DX and slightly shaking it around, it sounds loose. I'm test driving a 300mm 2.8 right now and notice it does the exact same thing. So, if there is an actual problem, I'm assuming it's the body. Does it sound like there's something wrong? Or is my OCD just kicking into hyper drive. Cheers!