I was given a 450d with a canon 17-85mm lens, it has USM and image stabilzing. It has always seemed okay to me but after a few years i have decided to upgrade to the 700d, which has now come with a 18-55mm kit lens. This one has STM and also image stabilzation.
I am mostly interested in the wide angle of the lens, so the extra 85-55 doesnt do much for me, and the 18-17 is pretty close for me purposes. What I have noticed though, is that the STM seems to be much more quiet than the USM. Is this STM the upgrade from USM or are they different things?
My question is which one has better image quality on the wide end. I am curious as to why as well, besides for seeing that the 18-55 has a wider aperature, the 17-85 just feels better. The feeling i mean in terms of industrial build quality, it seems to be less fragile. I also see that the end of the lens is over 60mm, not like the 52mm of the kit lens or the other intro lenses such as 55-250mm. Does this size have something to do with it?