This precisely. MySQL has made headway in recent years but is still miles behind PostgreSQL. No commercial database is in the same league when it comes down to it either.
Oracle has some nice stuff that PG doesn't have yet but PG is still the nicer database overall.
I'm still unclear under what criteria Oracle comes out on top of MSSQL. Aside from the extreme high end, I can't think of a circumstance where I'd prefer using Oracle to MSSQL.
