Canon 24-105 over tamron 18-270 vc

I currently have the tamron 18-270 vc lens I'm thinking of selling it and picking up the canon 24-105.

I now have both the sigma 10-20 and the canon 70-200mm f4

My question is should I expect better image quality with the canon it seems to me my Tamron sometimes comes up soft and I would like to get somthing more to the Image quality of my 70 -200 f4/

What do you guys think would this get me more what I'm lookng for in IQ or am I just wasting about 500 dollars I also have the Tamron 28-75 and the canon 50mm 1.8

Thanks...Alan

The 24-105 will be much better than the 18-270. It will not be as good as the 70-200 (the 70-200s are Canon's sharpest zooms and some of the best modern zooms out there period).

The 28-75 you have is a very good lens already though in that range, so unless you really want the IS and bit of additional range, you might already be covered well.