I had a ISF calibration of the Sony 600 es and he only did the Gain and Bias of the RGB for a custom white balance. He did not do a Hue Saturation or Brightness of the RGBCMY. Is this correct? He said that he does not need to do that. Is there any way I can ask him about this to confirm that he knows what he is doing.
very true but I was stuck after I agreed to the calibration
Sorry to hear of your experience with this guy. He doesn't help the cause. Maybe he didn't need to tweak the CMS, but he should have shown you. It's not uncommon to find some things right on the money, and it's fun to share that with clients. I really like clients to watch the calibration process, if at all possible. Most are fascinated with the process to start with. Yes, it can get boring, but it's kind of fun to show them the steps and have them participate.
That said, if I bought a 600ES and it needed virtually nothing, I would do nothing except set white luminance and verify pluge and color. If I had not sold the 600ES to the client, I would expect the possibility of little work to do and be prepared with a special lower price just to do basics and verify performance. That provides peace of mind and is of value, too.