So I just Purchased a Canon 10-22mm online b/c I couldn't find the L-series 16-35mm that wasn't overpriced. I have been reading online that some people experience having received a Lens and It actually was sub par than what it should be because of being manufactured in other places. or in other words they got a defective lens, but It is hard to identify. My Question is that since I'm an Amateur I really wouldn't be able to verify whether its defective, what should I look for? Am I just being Paranoid?