Every vendor is asked daily for comparisons between different products. Not having an answer would appear like Versant had something to hide. Versant's behavior was unwise because they proactively distributed the document.
From what CodeFtuures can see, a huge number of commercial projects are at least looking at Hibernate.
It must have been frustrating for Versant's sales team to have to compete with a product where the only costs are support fees to JBoss.