Perhaps we can predict what will be the differences/similarities between the 1dx3 and R5.
I guess:
1. 1dx3 will be much better build quality.
2. 1dx3 will be much better on battery life.
3. 1dx3 will have tripple the buffer.
4. 1dx3 will have shorter focus time (marginally so)
5. 4k video will be identical on both cameras.
6. 1dx3 will be a half stop better at high ISO.
7. The 'response time' will be better in 1dx3. (Much better)
What else?
I guess:
1. 1dx3 will be much better build quality.
2. 1dx3 will be much better on battery life.
3. 1dx3 will have tripple the buffer.
4. 1dx3 will have shorter focus time (marginally so)
5. 4k video will be identical on both cameras.
6. 1dx3 will be a half stop better at high ISO.
7. The 'response time' will be better in 1dx3. (Much better)
What else?