I have really been enjoying the 6D, had it just under 2 months and have never used anything from the 5D or 1D series. Also, I'm a very amateur photographer, just getting into DSLRs less than a year ago with my wife's T3 hand-me-down and her newer 70D. Up til then I have had numerous point and shoots or cell phone cams. After using the T3 and 70D I found that most of what I was photographing was in low light and even though they both have on board flash, using it gave less than spectacular results. So, there I was, bit by the bug and wanting my own DSLR. I purchased it after reading a lot of reviews and knowing fully what it could AND what it couldn't do. It is reasonably capable for some action from what I have found, although the 70D is better. I have done a few exif comparisons between the 2 and found what I expected, that the 6D produces better pictures at the same ISO (less noise) or for comparable aperture uses a lower auto ISO. I'm not proficient enough at the controls yet to be adjusting ISO, aperture, and shutter speed manually on the fly, so I'm usually in AV mode.