50D vs Mark III

[Punisher911]

Adorable subjects for sure....
I am agreeing with the "learning composition" a bit more. The rule of thirds isn't law by any means, but could have helped both of those photos. With her sitting off to the side of the chair, you probably could have centered the chair and the framing of the first photo is worse..

Now onto the question at hand, the 50d does seem to serve you well. You can never go wrong with adding quality lenses. Judging by the photos, it looked to be an overcast cloudy day giving low contrast. If you don't have LightRoom or some other photo-enhancing program, get one!! You could have made those colors and photos "pop" quite a bit more.

So in my opinion, getting a nice lens or two, learning some good composition techniques, and performing some decent post processing will get you much better results than buying any new camera., regardless of it's price or specs.... A bad shot with a Canon 5d,6d,1dx-whatever will get beat by a quality shot from your 50d every time.

 

[EIngerson]

You're talking multiple generations of camera upgrade. You will absolutely be astounded at the difference. There is no comparison between the 50D and the 5D MKIII. Make the change. You'll absolutely love it.