Just wondering, I usually use a UV filter just as a protection device for my lenses, so they're on there 99% of them time, unless I'm shooting something inside.
Now I have been experimenting with stacking cir-pol/IR filters recently and I really liked the outcome, does anyone else stack filters on a normal basis? UV and Haze perhaps?
After spending the money on expensive L glass, the last thing I'm going to do is slap a filter in front of it. I do use the lens hoods. But in my 30+ years of photography, I have NEVER damaged the front element of my lens.

