I needed sturdy so I wouldn't be affraid of bumping into people.
This made me laugh
why if i may ask?, I mean where I take this lens my camera sticks out and it bumps into people, handbags, and those sort of tings all the time.
Simple, because someone's handbag won't damage a lens. Unless of course it's an armour plated one. Lenses are stronger than that. The only time a lens is in danger is if it takes a real impact, with a wall, the ground, the corner of chair - something hard, and so on. Not a handbag. As far as damaging the front element of the lens goes, again, the better build quality of the 1.4 is a difference you can feel, not one that you can actually see in practice. If you have a filter on the lens, the build quality won't make any difference as the filter will take the impact.
Where do you go and shoot? If you shoot in night clubs, busy market places and so on, then fair enough.
I don't mean to pick at your choice, I just think the difference in build quality is more down to what feels better, quality wise. Not a difference you'll actually see in practice. If you were going to the antarctic for example, where you'd chose more rugged lens like a Nikon 24-70 over 18-55 kit lens, then fair enough.