SOA in practice is not about the communication framework, it's about the delivery culture and discipline of using published interfaces of any sort in the first place. Amazon is perhaps the most successful example of a CEO-mandated SOA, they didn't really need something like WCF. Netflix used RESTful HTTP mostly for theirs.

Of course everything else you say about logging, changing, etc. is correct - operationalizing a SOA is hard, which is why we see so many frameworks focused on cloud microservices today.