Consider view that Mr Darcy just a more handsome rich upper class version of self righeous presumptuous self centered buffoon Mr Collins in Pride and Prejudice?

No. They had similarities, but the contrasts between them were more remarkable.

Mr Darcy was proud and ill at ease with strangers (shy?). He was certainly presumptuous at some times, and it is possible he was self-centered, though we do not know that. He was hardly a buffoon.

By contrast, Mr Collins was also presumptuous and self righteous. He certainly seems to be a self centered buffoon. But he grovelled before those he thought were above him, and he did not connect to those he thought beneath. He also was excessively materialistic, a trait he actively covered by inflicting his moralizing on others who did not need it.

The twp were more different than alike, I think.