Upgrading how? The next suite up from the standard suite is the "Residence Suite King". The main difference is the standard suite has the bedroom as you walk in, and the living room as the secondary room whereas the residence suite has the normal suite layout where the living room is first. I prefer the standard suite in terms of furniture layout if I wasn't entertaining guests. The bathroom in the standard suite is a little bigger too.

I've received a complimentary upgrade to the Residence Suite a few times, and they once let me use a TSU to upgrade to it by paying the cash difference when there were no standard suites available.