Crad: I compared the same protocols, both TCP, both ASCII protocol. This is a fair comparison for sure with TCP, as with UDP you have many tradeoffs, so this is specifically a comparison of the TCP (reliable) protocol you can use with Redis.
About the binary protocol: I think this is currently not the widely deployed one, but the point here is that if the difference is about the protocol, even Redis could switch to a faster protocol using a binary one. Using almost the same protocol in both servers we are actually measuring the internals.
Anyway your reasoning can be applied the other way around. Many memcached systems are currently using CAS extensively while you can perform just one query with Redis atomic operations in many of the same real world scenarios. So should I double the Redis numbers by two because there is a faster way to do something in a Redis specific way?
About SET/GET ratio, I measured both SET and GET performances in an independent way, so I don't get it.