Just a personal experience regarding Canon's Kit lens - specifically the 28-90mm f/4- 5.6.
I know Canon's kit lenses have always been the butt of many people's joke. Yes, the lens are not all glass, not much coatings and extreamly light-weight in build. However, don;t start selling or giving them away...yet.
When I use my 28-90mm kit lens for B/W, the result is really great. I like the grainy B/W type so the 'low quality' of the lens really brings out the rawness of the image. I know the grainyness can be controlled during processing but using the kit lens really helps.
I have compared it with using my Sigma 24-70 f/2.8 and the result is not the same. The image is too 'clean'.
This is just my perosnal taste....or the lack of it
Anyway, just a thinker to anyone who is thinking of selling their kit lens for S$20.