Hi Chuck,
I am a happy 5D3 user since two month and would like to give you some feedback on a couple of issues:
Auto ISO: two things that might greatly improve its value: first, the maximum exposure time should be freely selectable (1/3 steps, all values supported by the camera). Second, the Auto setting for maximum exposure time should have a configurable safety shift (e. g. 1/focal length + x stops, with x being + or - and selectable in 1/3 stop steps up to 2 stops).
AF points: it'd be great to be able to choose the selectable points freely, not only from predefined sets (9, 15, cross-type, all). My problem with the patterns is that they don't include the outermost points.
Customization: it might have been nice to be able to map all available functions to all available buttons. E. g. for me there is no useful function available for AF-ON. I'd like to have the AF-One-Shot to -Servo switch there.
Illumination during servo AF: I saw your interview with Planet5D, so I guess you guys are aware and working on it.
The above order reflects the importance of these issues to my shooting habits.
Thanks for listening, cheers, Robert