Thanks useful information: 
Facts: Any filter will increase the chance of lens flare and any more glass between the sensor and the subject will have some effect on IQ (noticeable or not).
Like anything in photography its a trade off. YMMV
As for lens protection, esp from dropping, a UV filter is nowhere near as useful as a lens hood.
If you want to use a UV filter go-ahead, if not don't.
Personally I'd rather spend my money elsewhere.
Digital & film, Bits of glass covering 10mm to 500mm, and other stuff
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