I had a good chance to compare them pretty extensively and I found them very similar in sound. The C1 had a slight midrange scoop (around 600 Hz) which might be good for some voices and not so good for others.
I liked the build quality of the C1 better, but the V67G had a very slight sonic advantage. Not much, though. I'd be happy with either mic and I wouldn't say one is "better" than the other - just slightly different.
The C1 is more money, but it now has a bass rolloff switch, a 10 dB pad, and a nice case.
It's really six of one, half a dozen of the other. Buy whichever turns you on - you'll be happy with either mic.