Its a really basic shader. Nothing special. I think the secret and the magic for that is the high geometry (checker extruded faces) + Subsurface parameter in the shader. Be very carefull. Use very low changes in the Subsurface parameter number.
I would love to know how did you do to get that so clear cristaline glass in the cup and in the bottle (shader and light). Thanks!
Oh! Thank you so much. I will take a deep look into it.
First thing I checked is the glass shader and it is suprising for me.
How did you do glass shader?
This is my glass shader. I almost always get glass headaches in my scenes. 
But I think that my problem is with the lights to get a clear glass as yours.
Thanks. Out of curiosity I made comparison with your node set up and mine. Everything in the scene is the same just the nodes. I am surprised simple principle BSDF for glass in this occasion is effective.
Yours
Mine
Yes, as far as I know, Glass BSDF is exact the same as Principled BSDF with Transmission set to 1.
Im very surprised too with the complexity of some aparently simple procedural materials as metals.
I also found quiet a visible difference. ( principle BSDF) Especially where the glass neck fusses into bowl. Some nice light refraction going on there. Well defined glass properties.
I also find reflections to be more refined to my taste 
