Thank you. Yes, there is post production, the usual clarity, blacks, whites, contrast and exposure.
Given my previous attempts, I am quite happy with the results though not fully satisfied.
I used CZ24-70f2.8 and CZ24f2 prime.
As for next steps, travel to an area that has better dark sky, like Sierra Nevada Mountains (Eastern California),
and try a Tamron 15-30 or CZ16-35 or a UWA prime lens. Though most sites I researched recommended 1.8 or faster,
I am convinced wider angle is preferred over speed of the lens. We (my friend on a Canon 5DMIV) have been shooting
at less than 20 sec around 1000 iso without star trails. So speed of the lens could be an additive rather than a subtractive element.
Here is an example of CZ24f2 at f2 and 15sec exposre and iso 400. You can see the faint traces of Milkyway. Perhaps I could have gone to 3200 iso and obtained a better definition. At 24mm, I am looking at 20sec max exposure without star trails (500/fl rule).