In camera corrections
For my purposes anything in camera - other that recording image data - is nothing more than a gimmick. How can you possibly make a qualified determination on a viewing screen provided on a camera? If there is no other option for post process I suppose it would suffice, but as a work flow substitute?
I think the camera applies a standard correction - no user input required other than switching the correction facility on in the appropriate menu. It should be noted that it works with Pentax lenses only not third party lenses.