I have a second hand pair of CS7.2s that I purchased for ~7k that are in very good condition. I haven't heard the CS7s in comparison, so I can't comment on the merit of upgrading to the CS7.2s. In TAS's review of the CS7.2, one of the reviewers upgrades their CS7 to a CS7.2. You can purchase the review online for 3$ at TAS's website.
