I read somewhere that, if anything, the 10-18 was (is) slightly better in some respects to the 10-22. I bought my 10-22 a long while ago now but have always loved it; I was gobsmacked, in fact, as soon as I tried it out. It is also a stop faster than the 10-18 as well as having that bit extra at the longer end. Both though are very good lenses.