As language creators, we set the tone for the entire industry, or at least everyone working in our language. As a result, I would argue that people who program in haskell place a great deal more energy and care into how they express their code.
Haskell for a long time was used primarily by academics, and their students, so arguably its primary purpose was this expression, where as most other languages are invented for purely practical reasons and dwelling on exactly the right syntax might have been seen as a sort of endless bike shedding to be avoided, so that ultimately the practical concerns are addressed.
There are likely some objective measures of clutter even without knowing the specific problems at hand. How much do unrelated concepts blend together in the text, and so on. In c and c++, you really have a bit of boiler plate on every program, you can see this by comparing "hello world!" in these languages. Naturally, all those tokens on the screen that must be included in every program have very little to do with the actual underlying algorithm, or functionality.
Consider what the equivalent of sum types and product types and sums of product types look like in these languages. I think a very strong case can be made that Haskell is _objectively_ more "beautiful" than these languages, and if I am correct, even a complete novice will be able to discern this, given the examples to demonstrate.
James C