Interesting... such a vague term.
Back in my Canon xs days, I like the 60d over the t3i because of the auto focus points and the fps.
That was interesting to me.
What would Canon have to do to improve the t5i so someone in my similar position, a t3i or t3 owner, would be interested? We know it can't be better than the 70d. It can't be worse than the t5i.
How about this. Wi-Fi plus video out to your cell phone with wireless triggering and pinch and zoom focus capabilities. Zoom in using live view, control auto focus over your phone, take the shot and it auto shares to Facebook.
While we are at it... built in rf control over the 450ex-rt (guessing this will come out). Built in swivel bounce off the flash... just up and behind, but it would be better than head on.
You stay with sd... but also have a usb input to flash drive to copy.
Also have digital zoom that saves the original image and the in camera crop. Obviously a live mode function.
Auto saves to the stupid Canon cloud.