I absolutely love this question/thread! I was just thinking about my chickens, and how all of them seem to have their own level of love. I have a mixed age flock, but older ones that are most mature, will come *running!* up to me when I enter the back yard, and I have 3 barred rocks, 2 hens and 1 roo, who absolutely adore me. They will jump into my lap, and not get off. I put their heads on my shoulder like a baby, and they fall asleep!
Even the chickens that don't jump on my lap, love being right up next to me, but don't seem to want to be touched, but they want to be "present" with everyone else.
I definitely think they feel comfort, because that's how they create security in their coop. They know what feels safe, and unsafe. When they have learned that their coop is safe, and comfortable, they go back into their coop on their own. Without this comfort, they wouldn't. I could be wrong, at least that's what it appears to me. When a chicken is "scared", they run/scatter and find places to hide. (when predators attack...)
I've had a few times where a hawk came down, and they all scattered for hours, and wouldn't come out from hiding until night, when they finally came out of hiding and straight into coop for safety.