Kuhn, on the other hand, is making an observation of the normative manner in which science is done. Wielding the tools forged by Wittgenstein in the realms of language and cultural phenomena, Kuhn indirectly draws parallels between the manner in which science is actually done and the language games played in Wittgenstein's ontology.
Because of this difference in focus and approach, what results is Popper's "This is the epistemic grounding for the scientific exercise and methods" is set in opposition to Kuhn's "But this is what scientists are actually doing." In reality, there can be a reasonable synthesis betwixt the two. Popper, early on in Conjectures and Refutations, describes the different ontologies of the scientific method: essentialism/realism, instrumentalism, and what he calls "conjectures" but I like to call falsification (or, induction by falsifiability). Popper makes a compelling case for falsification as the most cogent ontology of science. Kuhn is, by his own admission, a staunch instrumentalist.
This instrumentalism is a matter of normativity. In the case of the indirectly observable (particle physics, quantum mechanics, evolutionary and global climate sciences, etc.) Popper's defense of falsification and attack on instrumentalism begins to falter, but not fail. Because instrumentalism has shown to get more quantifiable and marketable results (more journals published, more TV shows by Neil De Grasse Tyson, and more government grants), it has become the cultural MO for quite some time in the scientific community.
Kuhn explores the sociology and phenomena of scientific communities and the nature of change between different theories and methods of doing science. Insofar as he is making normative claims, he does an excellent job of showing how things are done. I feel that he fails in making claims as to how science should actually be done, essentially taking the normative case and saying that "it isn't fully developed yet, we ought to continue along this instrumentalist and diversified method of theory-making." without making a compelling case as to why that is the appropriate course of action.
This book, along with Poppers, is crucial to understanding the rationale and culture behind the claims made by physicists and philosophers of science today, especially when dealing with the limit-sciences of thins like quantum physics. As a work of literature, it is a bit rough to read. Where Popper takes 600-ish pages to explicate and defend 600 pages worth of material in a readable and concise manner, Kuhn takes 200-ish pages to explicate one central concept that could be done in less than 50 pages, applying the same rubric to multiple cases, over and over, in a manner that could be done more directly without losing any substance or rhetorical power.
There are more than one chapter in my unpublished book dedicated to epistemology and the synthesis between Popper and Kuhn, which have already strongly influenced certain blog posts, such as the post on Paradigmatic Awareness, in case one wants to explore related concepts before devoting time and money to reading the primary source.