Flame is actually much more subdued than you might think. I'm told that Blaze is much brighter. I don't have both, so can't do a comparison, but I've just added some modelling pics to my Flame Shopper reveal thread, so it's been bumped, and the colour in them is pretty good.
I love Flame, but it's more the colour of the Autumn leaves after they've fallen to the ground, not when they're still "Blaze"ing on the trees at the peak of the season

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TK posted some great red Crunch comparisons in this thread:
Please help me find the right Red for me They may have come from the comparison thread referenced above ^^ originally, I'm not sure.