Simple test here, all images taken in Leica SL and given same white balance. Link to all images here, but you will find some comparisons below.

TTArtisan

Pros

• 1/2 stop aperture clicks

• “Leica look”

• Smoother background blur

• Seemingly less barrel distortion

• Better screw-in hood

• Best CA performance in extreme back-lit situations

Cons

• More focus breathing

• Slightly less refined build

• Heavier at 413 grams with hood, no rear lens cap

Same

• Sharpness wide-open

7Artisans

Pros

• Better build

• Less focus breathing, lens remains same size while focusing

• Tighter build tolerances

• Lighter at 376 grams with built-in hood and no lens caps

• More contrast in extreme back-lit situations

Cons

• Only full stop aperture adjustment

• Slightly more CA in extreme back-lit situations

• “Busier” out of focus areas

Same

• Sharpness wide-open