The Canon 28-70 f/2 R is a full stop faster than the standard 24-70 f/2.8 that many pros use, and that’s a HUGE deal. That reduces noise by a full stop in low-light situations. It blurs the background more than has ever been possible. There’s a cost, though: size, and, well, cost. It’s $3,000. I compare it to the Canon 24-70 f/2.8 L II and the Canon EOS R 24-105 f/4.