My butt hurts!
I found that to be true. My old C4 seats and steering are the two things I would transplant to the C5; the only things I would transplant from the C4.
That said, it's all about how one is built. The C4 was great for comparatively thin and average height people, I'm 5'10" and 165. That is why they changed the seats in the C5: we are much heavier and getting taller as a people.
So for some folks, the C5 is more comfortable, and for others, the C4 is preferable.
I also do not find the C5 seats to be comfortable over long hauls. But everything else makes me forget about it, until I stop for the night!

I think you are right, I've grown 3" in the last year.
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