I do mean to put it humorously, but I seriously wonder if Max drove the ZX-14.
It is certainly OK to ask, although I don't think it is relevant. No, I haven't. But I don't need to...
Saying the ZX-14 has lots of power- power here, power there, although very true, doesn't change my stance. I can just as easily say the ZX-14 is a de-tuned C14. It was de-tuned in reliability performance, and de-tuned comfort performance, etc at the expense of gaining acceleration performance. Silly, isn't it? But just as valid a construct. But try saying that on a ZX forum and see how they like it. It is not a matter of "tuning", it is "design". "De" indicates "removed" or "removal" or such, combined with "tuned", it pretty clearly implies intentional or accidental inferiority. The C14 engine isn't inferior, it does what it was designed to do quite well. You, and perhaps others, might not appreciate or understand all that Kawasaki did with the C14 (some things I don't understand, myself), and that is OK, but that doesn't mean it was without valid purpose.
Do you really think Kawasaki designed and implemented an expensive VVT for the C14 (and ONLY the C14) as just a marketing gimmick?? And although not really about the engine, KI-Pass is not a marketing gimmick, it contains perfectly useful and valid features. Some might not like them, both others love those features. Personally, I love not having to fiddle with keys and just keeping a fob in my pocket (is it worth all the complexity...that is a good question, but a different topic).
It would have been much easier and cheaper for Kawasaki to have identical engines in both bikes. There are good reasons they didn't. They didn't make those changes to cause the Concours not perform well and the ZX shine in comparison; they created two different engines with different sets of performance goals, both performing their roles very well.
As for performance, I will end with the relevant Webster's definition, which I think fits really well:
"The manner in which or the efficiency with which something reacts or fulfills its intended purpose."