This is for a 2-target cleave 5 min fight, which imo fairly well represents progressing in HFC.

Granted this is with the default profile, crit obviously loses value if you do stuff like only initiate your combustion sequence with Sandman's pouch up (in SimC) or start flamestriking.
This is on-top on the added stability of crit (eg. not screwing your archimonde kill over by doing 50% of your normal dps and failing a doomfire checkpoint).
If you have HFC on farm and are chasing ranks, mastery might pull ahead due to all the fast kills, this is pretty irrelevant though as mastery is always gonna be best for parsing due to a higher dps ceiling.