So I currently own a 50mm 1.4, but am wondering if I should consider getting the 40mm or 28mm, to use as a somewhat 'normal' lens on my crop-sensored cameras. The main reason I'm considering, is because my Dad recently bought a 50mm f/1.2L, and my 1.4 doesn't seem as needed anymore. Also, I'm somewhat worried about the focus mechanism problems that have been known to occur with the 1.4. I'd mainly be using this lens to carry around during times I didn't feel like lugging around my 24-70 f/2.8 (Casual street phtography, family occasions, etc.) Suggestions?