The comparison with SQL Server is not very sound. SQL Server is MUCH cheaper. I would venture to say it is more performent and is on-par with features (certainly will be after the next realease). Moreover. SQL Server is not brute forced in the way you say Oracle is, especially with CRM. Maybe something like that happens with the ERP products, but much more mildly.

The most important difference is that SQL Server has everything that Oracle has to offer at a much, much cheaper price.

I agree that comparison with postgres and mysql are pointless. They offer a tiny fraction of what enteprise products have. If you need it, you will know.