I prefer to just get the raw sample data from the camera and do all the post processing on my desktop. If you think about it, what's going to yield better results? A small, embedded processor running from a battery that has to return a finished photo in a fraction of a second so you can keep shooting. Or a high power, CPU that can take as long as it needs to crunch the data.
Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs