Is retina display on the iphone 5s good?

Have an iPhone 4S the retina display us beautiful on it if I got an iphone 5s will the retina display be better or exactly the same.

The same.

The 5S has the same pixel density as the 4S, so it should look very similar. However, the 5S has a taller screen, which means that it has more pixels in total.
So, to answer your question, the 5S has a slightly bigger screen, but it really isn't a major improvement.