I never tried KDE-PIM for harmattan and I have no glue how it works. I'am happy with the native apps on the N9 if I can sync all relevant data with funambol using syncevolution. There are not so much tools on the market syncing not only calendar and contacts but also tasks and notes (or memos). May be you can get more information at http://blog.gmane.org/gmane.comp.mobile.syncevolution