- Other focusscreens
- Better display resolution, 1920x1080 minimum (!)
- Fokus peaking/zebras - lots of stuff from MagicLantern builtin (intervalometer and so on)
- WLAN, not for pictures, for control with DSLR controller app and so on
- Maybe a little bit lighter (as 5D2), size is ok. 60D and 6D is "too" small (ringfinger not included), so I used a battery grip on 60D, which I never missed on my 5D3.
- On or two additional buttons... the custom button is used for 99% of the users for switching AF modes... maybe I want another one?
- One or more button more on the top, and get rid of the double function with both wheels. I often switch the wrong wheel after pressing the ISO button, so I change the flash exposure compensation... Double function for White balance and measuring type is ok...
- A manual focus switch and stabilisation switch on body, so I can select this in custom programme C1/C2/C3... I often shoot at night, and I always have to switch both on the lens off (if available of course), but it would be easier, to get it only by using C1...
- I have no problems with megapixel or DR, maybe they could enhance this a little bit, but the features above would be more interesting...
Edit: And I want ISO 25, ISO 10 more than ISO25600++ (as possible base ISO, not shifted like ISO50 yet)