A used 5D Mark II is the best value for Canon shooters interested primarily in still image quality. While the autofocus system is less than ideal, the 5D Mark II offers the same image quality as the much more expensive 6D and 5D Mark III. Used, it’s about the same price as a Canon 70D, but the image quality far exceeds that of the 70D or any crop camera. For that reason, and because a used 5D Mark II is about the same price as a 70D, I recommend the 5D Mark II to photographers primarily interested in portraits or landscapes. The 5D Mark II’s autofocus system is similar to that of the 6D, though the 6D’s center autofocus point does better in very low-light conditions. The 7D and the 70D have far better autofocus systems for moving subjects, making them better choices for sports and wildlife. https://www.youtube.com/watch?v=sX_I9KPPdWY https://www.youtube.com/watch?v=NjR2OztuXtA https://www.youtube.com/watch?v=3WuwnAuvmTw
