I’ve compared both of my lens to find out that my 28-105 is sharp, but my 18-55 is a little sharper at about 28mm and 55mm. One thing that may have influenced my test is that the 18-55 was at a narrower aperture than my 28-105mm (f/5.6 vs f/4 and f/4 vs f/3.5). However, I took also a picture at f/8 on the 28-105, and it was still softer. For sure, it’s better to have a softer 105mm than a 55mm who needs heavy cropping…
I’m really not sure about which one I should keep. The only things that make me hesitate about the 18-55 is its sharpness and its IS feature. On all the other points, my 28-105 is a clear winner. It’s faster (in terms of aperture) than my 18-55. It’s way more solid (it’s the first metal mount lens I ever had) and the autofocus is faster and a lot more quieter. Full-time manual focus is also enabled on this lens. It makes me very hesitant…
I must say that my test was done at only a few feet from the test page. Next thing to check will be sharpness at a greater distance.
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