Straight from Lightroom with no edits (default sharpness). (Click photo for larger size)
ISO 6400, 1/50, f/4, 200mm, Canon 6D

ISO 20000, 1/80, f/4, 70mm, Canon 6D (no edits except defaults)

Here is a photo with the 7D, same lens (no edits except defaults)
ISO 4000, 1/50, f/4, 154mm, Canon 7D
