If you are willing to pay for it, you can get excellent quality glass for any brand of camera in any focal length. Sony glass tends to be a little more expensive than Canon. I really like my 50mm prime for indoor events and portraits; although, many would prefer an 85mm or 90mm prime for a tighter crop on the face. Primes are great because of the faster aperture which gives less depth of field for portraits, and faster shutter speeds for low light events. They also tend to be sharper than zoom lenses (especially noticeable when operating on a budget).
