I am making some spheres like these . Hence I need a surface similar to this.
First, you need a dense geometry. A mesh with a lot of faces to blend the reflections smoothly.
Second, about the sharp reflection, you have to use a shader with gloss/roughness settings. Set the roughness to very low, and you will have very sharp reflections.
Use Cycles nodes, like Glass shader, and give high IOR, like 50, for the reflections