I assume you've gone here. Johnson's schedule looks bad for the remainder of the year.
As for the playoff weeks, Cleveland and Detroit is a wash. Johnson appears to have the worst of it against Buffalo compared to Moss at Denver. However, Buffalo appears good against the pass only because their run defense is so bad that opposing teams constantly run, run, run. I'm not sure the Bengals would do that with Rudi Johnson.
Johnson has outperformed Moss and the Bengals will be fighting for a playoff spot. I think I like CJ.