Thanks for the link, @jamesstaddon! That 28-105 seems to have slightly better results than mine. Probably that’s because my manual focusing abilities are very limited ( I didn’t played with that very much…)
Anyway, I decided to keep the 28-105mm with my 7D. I tested it in real life situations, and I am really happy with it.
P.S., @buddingphotographer, that test page you linked, is it okay to download and print it? It’s copyrighted.