"Ok So your telling me I spent all that extra money for nothing to gain an extra stop but not IS. Is that what your saying. That does not make me feel good about my purchase anymore."
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I'm not a camera geek, I just take my new lens attaches to my 5D III and go out take pictures. If the pictures look sharp on my 24" monitor, then I'm good. If pictures are soft, then return it and get another one.
When budget is allowed, 24-105 users will end up with 24-70 II. Until then, their 24-105 is the best.
Just like food....see and smell are not enough, you gotta taste it.

JUST ENJOY YOUR NEW TOY and take picture of kid(s)