A great workhorse that convinces completely.

I use the 5dM3 for a year now and am very excited!
It was absolutely not an easy decision, such a lot of money in a hobby
investing noticeable to the limits and visible to expand.
Years I photographed with Canon APS-C format, most recently with the 60D.
The 60D in combination with the 15-85mm, L lenses and prime lenses are
already a good combination.
I commanded my 60d well and was really happy, but AL photographs
did not work in the desired quality and sufficient therefore no longer my claims.
The 5dM3 with full frame sensor plays as definitely in a different league.
Largely I use the same lenses as before, but I get a
significantly better image quality and can expand into high ISO regions as required
and get excellent results that properly prepare fun every time.
Basically, the entire image impression corresponding professional standards.

Pro:
+ Image quality all peripherally class.
+ Best Body ergonomics, workmanship and seals.
+ Autofocus makes very reliable and fast.
+ Class feel of all controls.
+ Color fidelity and high resolution display.
+ 100% viewfinder with grid overlay.
+ ISO low noise
+ Continuous shooting speed.
+ CF and SD Kartenslott (Backup)
+ Silent Mode

Cons:
- Price.
- Warranty period.
- AF in video and Live View mode.
- Weight, but robustness = weight.

Neutral:
- No swiveling display. I need not, because I do not take pictures in live view and snapshots
are not really feasible in this mode.
- No built-in flash. (I think) There is not a professional photo with built-in flash, as appropriate by
Objective is shaded the flash. Only as Master would be relevant, a built-in flash.
- The body is hungry for good lenses, what if one gets at the end of what you'd expect sooner or later brings costs.

All in all, an awesome camera, which I'll secure the next few years may have my joy.
A lot of good I could tell, but I think everyone gathers his own experience and focuses on other parameters in its "everyday photographers".
I hope I could contribute something good with my review because I am also a grateful recipient of good reviews ever.
Wishes always good lighting.