I'm a major opponent of Kodak due to numerous slip-ups by the company which the largest one cost me $14,000 for a heap of junk, so I'm biased.
Regardless, I find the 7xx series to be better overall than the 6xx series in many aspects.
Oh, and if you're looking for electroniv view finder (EVF), Kodak has THE ABSOLUTE BEST EVF on the market at the moment.