jocau wrote in post #15579586
For months I've been wondering if I should get a 6D or a 5D3 and almost everyday my preference changes. I have a 550D (T2i) right now and I want to buy a fullframe camera because I'm not satisfied with the amount of noise I get when going higher than ISO800. I don't shoot so many pictures a year (about 1000-2000) so I'm having a hard time justifying the price of any of the mentioned cameras. However I'm a perfectionist who wants as little noise as possible and who wants the camera to really nail the focus so I can get really sharp images instead of images with focus errors in it.
Any full frame camera will give you noise improvements over your T2i. That's just simple physics.
The question is which to choose: 5D3 or 6D. I'd say for the amount you shoot and the subjects you shoot, the 6D is the better choice. The focusing system of the 6D is not as sophisticated as that in the 5D3, but you don't really need a system like the 5D3 AF. And, I bet it's better than what's in your T2i. If you are happy with the focusing on your T2i, the 6D will be at least as good and likely much better.
As for wifi, the 6D has wifi built in, but the 5D3 does not. To get around this, I use an Eye Fi card in the SD slot of my 5D3. I record JPGs on the SD card, and RAW on the CF card. The Eye Fi dumps the JPGs right onto my iPad or computer for instant viewing. It works great.