I really like my C, but once I bought a Counselor the C became a safe-queen. I've been thinking about selling it. Biggest issue for me: the updated grip texture on the C shreds my side, so I have to wear an undershirt to carry it or my day becomes unpleasant. I don't need to do that with the Counselor. Generally for me the more aggressive the grip the better, but I can get just as secure a grip on the Counselor and it is much more enjoyable to carry. The trigger is no slouch on the C, but not quite as crisp as I expect on a high-end 1911. The Counselor trigger is perfection.
Like Valor and others, I'm interested to see your comparison. Great idea to throw the Sentinel into the mix.