Well, there are some points I see:
-in your coca-cola reference, pay attention that sidelights are not equal, i.e. not symmetrical. Symmetry in lighting is what you should avoid as it’s way too static, especially with centered objects like products, which are already pretty fixed. So make one light not equal either in position or intensity
-you seem not having a good black edge, thee’s something with your shader. Set “exit color” to black perhaps, and check if your liquid is done correctly: it should overlap with the glass a bit in vray. And once again, watch the sweep going just behind the edges of the frame, not much more
-the arealights in your renderings are way too subtle, make them much brighter: look in your coca-cola examples, they are almost white, this gives a nice sense of contrast
-in both your renderings, the background should be more subtle to me: first of all the line below is too contrasty, and attracts too much attention. That’s why you use a sweep - to get rid of distracting edges. In your coca-cola example all you pay attention to is bottles, and it should be like this. In the darker variant, maybe try to make the background gradation a bit more subtle
-the framing could use more space around the glass, just my opinion.