A bit too strict for me, though we probably approach these issues from the same Kantian root:

"Act only according to that maxim by which you can at the same time will that it would become a universal law."

I suspect that you have taken this a step further and determined that it 'has become a universal law'?

Im inclined most to agree with Sadistic Saviour's view stated earlier - each situation must be judged on a case by case basis. My position would be that these judgements must be made, however, with reference to the maxim of universality noted above.

A simple reference merely to 'ends' alone leaves the subjective free will of each individual to indulge in their own personal tyranny, from the ethical viewpoint.

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"A man's work is nothing but this slow trek to rediscover, through the detours of art, those two or three great and simple images in whose presence his heart first opened."