The Canon RF 135mm f/1.8 L USM not only makes a case for itself as the best Canon prime lens, but as the best 135mm lens period.
Canon RF 135mm F1.8 L IS USM Lens Review
Hands-on with Canon's RF 135mm F1.8 L IS USM lens: Digital
Canon RF 135mm F/1.8L IS USM Released - Fast Stabilized Portrait
Canon EOS R6 Mark II + RF 135mm f/1.8 L IS USM
Canon RF 135mm f/1.8L IS USM Review & Sample Images by Ken Rockwell
Canon RF 135mm F1.8 L IS USM Lens Review
What is the Canon 18-135mm Lens Good For? Is It Useful For Beginners?
Hands-on with Canon's RF 135mm F1.8 L IS USM lens: Digital
Canon RF 135mm f/1.8 L USM Review: Setting a New Standard
Canon RF 135mm F1.8 L IS USM Lens Review
Canon RF 135mm F1.8 L IS USM Lens Review
Canon Unveils the New Ultra High-Speed 4K Hybrid Full Frame EOS R