It does seem from all I've read the 24-70 is a good choice. Can you rent one locally to try it out? Just to be sure it's better.
I like my 24-105, because it's a "pretty decent" lens and the range is perfect for me walking around getting typical shots. And it was a good price / value.
Any chance your 24-105 has an actual problem? What sort of apertures are you using? Something like 5.6 usually gives best sharpness, best test is on a tripod (turn off IS), bonus if your tripod is heavy or weighted.
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