Yesterday I impulse bought a 28 1.8 from B&H. Now I am reading these terrible reviews of this lens, especially photozone.de which gave 2 stars for optical quality. I bought mainly for its f/1.8 and normal view on crop factor. Most reviews points out poor contrast/color, CA, and not being tack sharp from 1.8-2.2. Is this lens that bad? Why would canon sell lens with that many issues at relatively higher price point? Anybody have experience using it? Thanks!