You are correct for Atlanta, but not for CVG. CVG agents love CHQ flights because it means they get to be over at concourse A where nobody watches them. Its the senior position for ramp agents and has nothing to do with which airline flies in. They love ASA and Comair flights over there too. Orlando gate agents can't stand handling CHQ flights. RDU agents don't give a crap either way. Take your pick.
In Atlanta, the ramp agents hate Comair because the Comair pilots constantly write up when the rampies are lounging around the tug when we're waiting to be marshalled. Comair opened a can when they went in to Atlanta and we had Ops managers down their every week complaining to ASA how pi$$ poor their rampies were doing. It resulted in the change in parking schema, and the service did improve, at least until those ramp agents quit. At least now you don't see fuel trucks driving through lines of boarding or deboarding passengers, and one time I even saw a rampie break into a run in order to marshal an airplane in. Of course the other two wing walkers were still rolling a fattie down by baggage, so we waited, but at least I can say I saw one run.
ASA had largely resigned themselves to the fact that their Atlanta ramp was going to suck. I can't blame them. Their management would do about as much to improve the ramp as it did to stimulate labor negotiations...nothing.