As I said, CA is fairly common for prosumer, with or without tkon. Its nothing to worry about. Even DSLRs with decent lens will have CA too.
Eh Melvan, sorry have to disagree with you there. not all prosumers give CA, and usually CA is less likely with smaller lenses/sensors. actually FZ18 has very well controlled CA. As a normal rule of thumb CA usually happens with bigger aperture lenses at the standard to ultra wide range. To me CA is more of a dSLR problem. (Unless you use primes? ^^)