I'd say right on the money.

It looks like a question mark cat to me - in the pictures I've seen of comma cats, they're paler, almost white. Here's a picture of some of mine, but QM cats are variable, so yours and mine won't necessarily look exactly alike.
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MissSherry

So I guess this begs the question of why? Is it dependant on the host plant that they choose, or is it regional variables?

Those are cute miss sherry - they actually look like little question marks :) Mine was too shy to unfurl - probably because I knocked it down 15 feet to take a picture!

I don't know why they're variable - mine use hops vines, too, so I guess it's just regional. Many caterpillars have more than one look - cloudless sulphurs, black swallowtails, red admirals, etc., but the adults turn out the same.
MissSherry