I suspect they would be comparable.
They were compared in the magazines, and if I recall correctly, the big 1600 has a bit more oomph...I forget exactly what, but it had enough 'extra' power and/or acceleration it was worth mentioning. It wasn't like it walked away from the C14 by any means, but I think side by side, the 1600 would walk on the C14, even if it was just a little bit.
I'm only going by fuzzy memory here, and I can't even look it up as I tossed about 40 pounds of magazines last week as part of my 5S blitz in the garage....lol. You'll have to talk to Gary about that one...lol.
To say that it would beat a C14?....It might...by a little.
To say that it would walk away from a C14 without any trouble? Don't think so.
To say that a k1600 is as fast as a ZX14 or ZX14R is really kinda silly, even from the pinky finger in the air and wine-sippin' BMW crowd;)
JMTCW,
Rem