quote:

2)Regarding the 3.5-5.6 numbers....generally, the smaller, the better for the same focal length lens....IE, a zoom of 70-200mm f2.8....is superior to a 70-200mm f3.5-5.6.  It has greater light transmission capacity ( which helps in focus aquisition, amongst other things) which also means bigger glass ...unfortunately it comes at an increased cost.

...and often at the expense of quality.
Which is less of a problem if your camera's sensor is not full size, and, as such, does not use the lens up to the outer rim.
That's also the reason why that 28mm isn't "28" anymore. In fact: it still is, but only part of it is used.

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