Originally Posted by roscot 
Purple fringing is really sensor bloom. This is the case in your examples. The DR was just to much for the sensor to handle. It has nothing to do with the lens.
I beg to differ. Certain lenses (mostly zooms, but also some prime lenses with many elements) are much more likely to cause purple fringing (call it sensor bloom if you prefer) than others. Lenses with a very contrasty rendering are also more sensitive to this problem.
Originally Posted by roscot CR is associated with a lens where you get red/cyan or blue/green color cast along high contrast edges.
I think nobody here was talking about chromatic aberrations (I guess this is what "CR" means), which is indeed a different problem.
Cheers!