If you want concrete benchmarks, they compare to RocksDB and Redis around page 10 of their academic paper. (https://www.microsoft.com/en-us/research/uploads/prod/2018/0...)

TL;DR:

I find their choice of benchmarks to be very convenient.

They tested on in-memory 8 byte payloads and were way faster than RocksDB and Redis. They then tested against only different configurations of themselves for configurations that hit disk. They also tested an embedded version of their software vs a Redis that hits loopback (rather than e.g. running against the raw redis data structure implementation, which would have been a more fair comparison).