You asked

Is the 7artisans 50mm f 1 4 tilt shift worth buying used?

Yes, I think it's a sensible one to buy used. It's a manual-focus prime, so there's no autofocus motor to wear out, and as buying used says, good gear is often much cheaper secondhand.

Know what you're getting first. It's manual focus only, it isn't stabilised, and it's made for APS-C. On Sony E or Fujifilm X it frames like about 75mm on full frame, and on Micro Four Thirds like 100mm. Check the product page to confirm your body is listed. If you're buying a used body too, budget for a new battery, as the buying used notes suggest.

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