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Hi Leon,
I have noticed the beneficial effect of UV filters in some instances, often in well lit distant landscape shots. It was very evident when we toured Tasmania on distant mountainsides where the filter helped cut through the blue-ish /white haze and thereby improve contrast somewhat. I wish I could remember exactly where in TAS as it was a beautiful long valley. I will have to go back through some old video for my own curiosity.
Another point is not all cameras, or lenses for that matter, respond down in to the sub 400nm-ish range, so in some instances one may not need it for UV filtration purposes.
Some use them for permanent lens protection, but I tend to prefer none, using a lens cap when not in use. There is also the possible issue of reflection/ghosting with additional glass.
Best
JA
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