What lens do you find consistently gives you the best artistic results and why?...
Nobody says gear doesn't matter. But it's not related to art, most of the time.
And as far as I understand (non native English speaker) the threadopener asked for the lens that gives artistic results.
I understand that he knows not the lens alone makes "art". I think every one here knows.
But probably for some photographers one or the other lens helps him better to create the art he wants to photograph.
It seems for you all your lenses work the same. For me not - I have >300 lenses, and those I mentioned are by far those who give me the best output.