if you want a raw based histogram, shoot in neutral, pull back the contrast slider all the way.
Right now the pentax k5 has a 14 stop dynamic range. the new sony sensor is amazing that way. There are images posted of it being pushed by 5 stops or so, and you still dont get the ugly banding.
the 3 things that i want, in that order
1. Better autofocus. 7D's would be fine
2. Better dynamic range in low iso, with cleaner files. the high iso is already pretty good. I just want a little more DR and cleaner files at low iso
3. improvements in video function. Allow me to dial in ec in manual video and auto iso. improve the live view autofocus.