In the new Kontact it is extremely hard to distinguish shared calendars. I am using Kontact 4.8.1 (from Fedora rpm packages) with a Kolab server and others are sharing their calendars with me. Unfortunately they are all just called "Calendar" - in the preview area on the left - when one double clicks on an appointment - when using calendars side by side in the heading of the column So the only way to distinguish them is the color. In the past th calendars were properly labeled as "My calendar" and "Joe's calandar" everywhere. Please bring this behavior back.
I fixed this in master a few weeks ago. Unfortunately, due to new i18n strings I am unable to backport for 4.8