One of the dav1d team shared a benchmark on twitter suggesting that single core rav1d was about 6% slower than dav1d but multicore was 35% slower.

https://nitter.net/rbultje/status/1924136075426951200

But the rav1d project has 8 core benchmarks on their GitHub suggesting more like 8-10% slower on arm.

https://github.com/memorysafety/rav1d/issues/1294