9VIII said:2. Better battery life. I don't know what it is about Canon's most recent bodies but they're giving the batteries a really hard time. 600 shots for a pro body sounds really bad.
I was equally surprised when moving from crop 60d to full frame 6d - it's just above 1000 shots average now (with some image reviewing and gps on) while with the 60d I could shoot myself silly on just one battery.
I've been told that the reason for this (same might apply to 5ds) probably is simply the sensor's power consumption, so little Canon can do about it - except of course shrink the process or license Sonikon sensors :->
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