Fonts used by kpdf doesn't looks really good. I've found more details about this on https://bugs.launchpad.net/ubuntu/+source/poppler/+bug/26118 and tried recommended solution. It works (I'll attach patch) - fonts now looks much better - but I'm not sure is it correct way to go. Also I wonder why kpdf ignore my configuration in ~/.fonts.conf and hardcode such things... Reproducible: Always Steps to Reproduce:
Created attachment 168236 [details, diff] disable font hinting
in CVS, thanks for the patch